support large file with namespace value length limit override

support json and yml config files

change package name extend to spi

refactor portal package structure

 improve delete namespace

bugfix: init user visited apps error when local storage stored app wh…

branch restful api add permission validate

fix cat log udpate gray release rules event

bugfix: branch modify master's item should ignore some field

bugfix: modify item dont need select cluster

fix npe

abtest

rest template log error to local file when call fail.

change app name limit to 128 characters