Updated documentation after release of auto-value plugin 1.0.1.
Now using the auto-value plugin directly within sample-project so that Travis CI build succeeds.
Added change log for integration test plugin
Added integration-test plugin example usage to sample project.
A short info is logged on applying auto-value plugin.

The task group definition has also moved to the plugin itself avoiding code duplications.
A short info is logged on applying the integration-test plugin.
The querydsl-plugin/extension stub has been added.
Fixed some documentation issues.
Fixed some documentation issues.
Changed the task group of the integration-test plugin.
Fixed broken unit test.
Added first functional version of the querydsl plugin.
The init task of the auto value plugin has been simplified.
The querydsl now also registers its created sources dir at the compileJava task.
Temporarily disable querydsl plugin until it is released on Gradle plugin portal.