Fix compile issue. Add new rest-service Object: SegmentsMessage.java. It uses Gson(JsonAdapter) as serialize/deserialize tool.

Remove collector dependency from agent-module. We will use HTTP-restful-service. Remove unnecessary dependencies/shades on collector and agent sides. Fix CI issue.

2.Release the prototype of ‘TraceSegment’.

#62 provide skywalking-application-toolkit and skywalking-toolkit-activation submodule, and log4j 1.x plugin to output TraceId

1.remove webui useless demo.  2. solve webui compile issue. 3. remove old test case, waiting test scenario by docker tech. @ascrutae

add elasticsearch 5.0.1 custom edition to skywalking-storage lib. use it as data index sevice (independence process).

Fix some resources leak. Format log. Set jdk level of common lib to 1.6 . Fix some incorrect pom.xml .