Require Java 7.
Added JTrim as a dependency.
Fixed a link in the readme.
Fixed warnings due to list and combox being generic in Java 7.
Update Java version in the pom.
Using diamond operator.
Standardized argument verification.
Using try-with-resources.
Opened JTrim for extensions.
NbListenerRef now extends ListenerRef.
Added method to convert ListenerRef to NbListenerRef.
Replaced InitLaterListenerRef with class with the same name in JTrim.
Minor refactoring in GradleProjectLogicalViewProvider.