Add anonymous logic in GerritConfiguration

Change-Id: If10e47f77d0933f67a1dff314c2a9e946836faf5
Reworked for injection.
GerritConfiguration, GerritConnector and GerritFacade now implements BatchComponent.

Change-Id: I398c28a886e4a544e44940b76ea958955b6932b2
Merge pull request #3 from mildis/injection

This is a rework of the plugin to use native BatchComponent and injection feature of SonarQube.

It requires SQ 4.5.1+ LTS
Version bumped to 2.2.0-SNAPSHOT