Issue #1: new empty command 'bugfix-finish'
Create .travis.yml
Issue #1: extract MergePolicy to new file + move merge code from FeatureFinish to GitUtils
Issue #1: add releasePrefix in GitConfiguration
Issue #1: base code of BugfixFinish (extends FeatureFinish)
Javadoc: add javadoc in MergePolicy
Issue #1: advanced parse args in BugfixFinish
Issue #1: move getBugfixBranchName & extractRootFromBranchName in GitUtils
Issue #1: more junit on BugfixFinish
Merge branch 'master' into feature/bugfix-finish

Conflicts:
	src/main/java/org/talend/geat/commands/CommandsRegistry.java
Merge branch 'feature/bugfix-finish'