Build process should clear build/libs after finishing creating dist/

[leijurv]

So that people aren't confused and use the pre proguard jar. build/libs is a standard place to look, and there is a jar there that looks like the valid build result, however that jar shouldn't be used, so it should ideally be deleted after completion. Could be added to ProguardTask.cleanup or similar.

[iamraviutsav]

I want to work on this

[kufupa]

Was this completed or should I have a go?