1. Remove the “apm-trace” module, isolate the trace structure between agent and collector for considering performance.
2. Change the head name.
3. Provide potienal mechanism for ignore trace with certain suffix.

Remoe health-report module. Because the HealthCollector is based on ConcurrentHashMap. This triggers a performance issue, when the TPS is very high.( > 500)

2.Release the prototype of ‘TraceSegment’.

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