Define depepndencies' versions as property and some removal of duplicate config to parent

pom.xml

@@ -8,40 +8,55 @@
         <version>1.2.2.RELEASE</version>
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
+
     <groupId>de.codecentric</groupId>
     <artifactId>spring-boot-admin</artifactId>
     <version>1.1.3-SNAPSHOT</version>
     <packaging>pom</packaging>
+
     <name>Spring Boot Admin</name>
     <description>Spring Boot Admin</description>
     <url>https://github.com/codecentric/spring-boot-admin/</url>
+
     <properties>
-		<spring-boot.version>1.2.2.RELEASE</spring-boot.version>
-		<hazelcast.version>3.3.3</hazelcast.version>
+        <java.version>1.7</java.version>
         <main.basedir>${basedir}</main.basedir>
         <passphrase>${gpg.passphrase}</passphrase>
+
+        <spring-boot.version>1.2.2.RELEASE</spring-boot.version>
+        <hazelcast.version>3.3.3</hazelcast.version>
+        <commons-lang3.version>3.3.2</commons-lang3.version>
+
+        <build-plugin.jacoco.version>0.7.3.201502191951</build-plugin.jacoco.version>
+        <build-plugin.coveralls.version>3.0.1</build-plugin.coveralls.version>
+        <build-plugin.gpg.version>1.5</build-plugin.gpg.version>
     </properties>
+
     <modules>
         <module>spring-boot-admin-server</module>
         <module>spring-boot-admin-server-ui</module>
         <module>spring-boot-admin-samples</module>
         <module>spring-boot-starter-admin-client</module>
     </modules>
+
     <organization>
         <name>codecentric AG</name>
         <url>http://www.codecentric.de</url>
     </organization>
+
     <licenses>
         <license>
             <name>Apache License, Version 2.0</name>
             <url>http://www.apache.org/licenses/LICENSE-2.0</url>
         </license>
     </licenses>
+
     <scm>
         <connection>scm:git:git://github.com/codecentric/spring-boot-admin.git</connection>
         <developerConnection>scm:git:ssh://git@github.com/codecentric/spring-boot-admin.git</developerConnection>
         <url>https://github.com/codecentric/spring-boot-admin</url>
     </scm>
+
     <developers>
         <developer>
             <name>Thomas Bosch</name>
@@ -54,22 +69,11 @@
             <organization>codecentric AG</organization>
         </developer>
     </developers>
-	<prerequisites>
-		<maven>3.0.0</maven>
-	</prerequisites>
+
     <build>
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-compiler-plugin</artifactId>
-				<configuration>
-					<source>1.7</source>
-					<target>1.7</target>
-					<encoding>utf8</encoding>
-				</configuration>
-			</plugin>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-source-plugin</artifactId>
                 <executions>
                     <execution>
@@ -98,17 +102,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-gpg-plugin</artifactId>
-					<version>1.5</version>
-				</plugin>
-				<plugin>
-					<groupId>org.apache.maven.plugins</groupId>
-					<artifactId>maven-surefire-plugin</artifactId>
-					<version>2.17</version>
-				</plugin>
-                <plugin>
-                    <groupId>org.codehaus.mojo</groupId>
-                    <artifactId>exec-maven-plugin</artifactId>
-                    <version>1.3.2</version>
+                    <version>${build-plugin.gpg.version}</version>
                 </plugin>
             </plugins>
         </pluginManagement>
@@ -153,7 +147,7 @@
                     <plugin>
                         <groupId>org.jacoco</groupId>
                         <artifactId>jacoco-maven-plugin</artifactId>
-						<version>0.7.3.201502191951</version>
+                        <version>${build-plugin.jacoco.version}</version>
                         <executions>
                             <!-- Prepares the property pointing to the JaCoCo
                             runtime agent which is passed as VM argument when Maven the Surefire plugin
@@ -179,12 +173,13 @@
                     <plugin>
                         <groupId>org.eluder.coveralls</groupId>
                         <artifactId>coveralls-maven-plugin</artifactId>
-						<version>3.0.1</version>
+                        <version>${build-plugin.coveralls.version}</version>
                     </plugin>
                 </plugins>
             </build>
         </profile>
     </profiles>
+
     <distributionManagement>
         <snapshotRepository>
             <id>sonatype-nexus-snapshots</id>
@@ -197,27 +192,28 @@
             <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
         </repository>
     </distributionManagement>
+
     <dependencyManagement>
         <dependencies>
             <dependency>
                 <groupId>de.codecentric</groupId>
                 <artifactId>spring-boot-admin-server</artifactId>
-				<version>1.1.3-SNAPSHOT</version>
+                <version>${project.version}</version>
             </dependency>
             <dependency>
                 <groupId>de.codecentric</groupId>
                 <artifactId>spring-boot-admin-server-ui</artifactId>
-				<version>1.1.3-SNAPSHOT</version>
+                <version>${project.version}</version>
             </dependency>
             <dependency>
                 <groupId>de.codecentric</groupId>
                 <artifactId>spring-boot-starter-admin-client</artifactId>
-				<version>1.1.3-SNAPSHOT</version>
+                <version>${project.version}</version>
             </dependency>
             <dependency>
                 <groupId>de.codecentric</groupId>
                 <artifactId>spring-boot-admin-example</artifactId>
-				<version>1.1.1-SNAPSHOT</version>
+                <version>${project.version}</version>
             </dependency>
             <dependency>
                 <groupId>org.springframework.boot</groupId>
@@ -227,7 +223,7 @@
             <dependency>
                 <groupId>org.apache.commons</groupId>
                 <artifactId>commons-lang3</artifactId>
-				<version>3.3.2</version>
+                <version>${commons-lang3.version}</version>
             </dependency>
             <dependency>
                 <groupId>com.hazelcast</groupId>