Add plugins and notifications support to docker builds
Refactor plugin creation methods into a common class.

Remove duplication from DotCiPluginAdapter and DotCiPluginNotifier.
Merge branch 'master' into run_docker_plugins

Conflicts:
	src/main/java/com/groupon/jenkins/dynamic/build/repository/DynamicBuildRepository.java
Merge remote-tracking branch 'origin/master' into run_docker_plugins

Conflicts:
	src/main/java/com/groupon/jenkins/buildtype/plugins/DotCiPluginAdapter.java
	src/main/java/com/groupon/jenkins/dynamic/build/repository/DynamicBuildRepository.java
	src/test/java/com/groupon/jenkins/buildtype/install_packages/buildconfiguration/PluginsSectionTest.java
Merge pull request #77 from groupon/run_docker_plugins

Add plugins and notifications support to docker builds