Fixed lots of warnings based on new 1.7 stuff (a.o. diamond notation and
try-with-resources)
Merge branch 'java1.7' into core_refactor

Conflicts:
	alitheia/core/src/main/java/eu/sqooss/impl/service/updater/UpdaterServiceImpl.java
	alitheia/core/src/main/java/eu/sqooss/service/pa/PluginInfo.java
	alitheia/core/src/main/java/eu/sqooss/service/util/FileUtils.java