Fixes gh-1076

Fixes gh-1080

fixes gh-1074

* fix-hardcoded-path-encoding:
  Fixed the path encoding in ProxyRequestHelper when the character encoding was specifically set on HttpServletRequest.

Fixed the path encoding in ProxyRequestHelper when the character encoding was specifically set on HttpServletRequest.

When the character encoding was set to UTF-8 for example, the path was correctly decoded in PreDecorationFilter but was reencoded in ProxyRequestHelper using the Servlet default ISO-8859-1. This commit uses the character encoding when set and fallback on default.

* pull979:
  Use request.characterEncoding prior to default encoding

fixes gh-647

* issue-1041-fix:
  Enables Hystrix metrics poll interval config.

Fixes gh-1041

* patch-1:
  Support header placeholders in SpringMvcContract.

When using property placeholders in the @RequestMapping annotation the ones placed in the headers attribute do not get replaced. This appears to be because the other attributes, such as the url, use the resolve() function to perform the substitution whereas the header is parsed as-is. This change adds a call to resolve for each side of the equals in the header string so that the properties are substituted correctly.

* ribbon-2.2.0:
  Upgrade ribbon to 2.2.0

fix gh-1045

If there is no content type incoming, then it should be
absent in the outgoing request (not "null").

Fixes gh-1037

fixes gh-1030

fixes gh-1044

Fix minor misspelling in docs

The Angel client has an idiosyncratic way of calculating an instance
id, and the Brixton client aligned with that already, but the
Brixton server did not. This change should make Brixton Eureka
Servers work with Angel clients.

See gh-978