More diagnostic for model loading.
Upgrade to Gradle 1.6 to get Android support working.
The version does not require to load Model subclasses only.
Few new libraries added to fix classpath depedencies.
Test cleanup - remove empty stubs.
Expose gradle API and model for extension.
3rd party extension can depend on them 
or the extension may need to access some official model.
Merge branch 'nbandroid_integration_radimk' into nbandroid_integration

Contains upgrade to Gradle 1.6