* POC: Intercept successfully.
* Refactor codes
* Build the new core
* Setup the new core.
* Push the javassist version to 3.23.2-GA, as it is the last version supports JDK 1.6 compile, according to https://github.com/jboss-javassist/javassist/blob/rel_3_23_2_ga/pom.xml#L149-L160
* Finish the all codes.
* Document updated for bootstrap instrumentation.
* Add a notice to document.
* Remove unexpected file.
* Set javassist version right. Add judge in core interceptors
* Fixe no log bridge implementation
* Lock oracle and resin plugins version.
* Move resin and oracle plugin to openskywalking
* Restore submodule active.
* Add another submodule active command.
* Remove the wrong test cases in release and fix some doc issues.
* [maven-release-plugin] prepare release v6.0.0-alpha
* [maven-release-plugin] prepare for next development iteration
* Fix some doc
* provides a optional-plugin for tracking ignores enhancement(#1203)
* trace ignore plugin config support override by system.env
* optimize the trace ignore plugin and make normalization of pom
* add AntPathMatcher and an junit test for it
* No longer rely on the spring framework
* add license at file header
* rebuild pom and rewrite README
* rebuild optional-plugins pom
* clean up useless code
* modify junit
* rewrite the ant path match logic
* rename the matcher class