fix #140 ,add log bridge from slf4j to log4j that could see logs from http sever start.

fix issues #141, use gson stream to deserialize http posed segments json array

* master:
  Update README.md
  modify code style
  modify code style
  modify test case
  modify mongodb
  modify MongoDBMethodInterceptorTest
  Add a flag to determine whether to bind data
  fix bugs
  Support plugin for MongoDB

Update README.md

Support plugin for MongoDB

* master:
  fix collector cannot start issue
  Fix ci-fail.
  Add “checkStyle.xml” and “codeStyle.xml” files, varify the code-style when “mvn compile” and CI. This is the initialized commit.
  Update LICENSE
  Update LICENSE

# Conflicts:
#	skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/config/EsConfig.java

Response for "Add checkstyle", close #149 

fix collector cannot start issue