[clean-up] Suppress optional java warnigs in emf-gen. Added missing source entry in ide.common. 
[clean-up] Suppress optional java warnigs in emf-gen.
Added missing source entry in ide.common. 

Change-Id: Ie71e583ce73f4cbe3fbd6a9d91fdc92bb3c44144

miklossy/xtext-core,miklossy/xtext-core