Added string serializer. Instrument method of RecommendersBuilder now sends
sezialized map. Added dependency of IdeaCodeRecommenders module.
Merge remote-tracking branch 'origin/jps-plugin-example' into jps-plugin-example

Conflicts:
	.idea/artifacts/jps_plugin_jar.xml
	recommenders-jps-plugin/src/ru/spbau/jps/incremental/recommenders/RecommendersBuilder.java
Merge remote-tracking branch 'origin/jps-plugin-example' into jps-plugin-example

Conflicts:
	.idea/artifacts/jps_plugin_jar.xml
	recommenders-jps-plugin/src/ru/spbau/jps/incremental/recommenders/RecommendersBuilder.java