Migrate to Typesafe Config and the HOCON syntax

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>
Merge branch 'refs/heads/hocon'
Add unit test to the WebJarDeployer

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>
Revert "Merge branch 'refs/heads/hocon'"

This reverts commit ab5e477b935f45bad2028862404fecbc77f423cc, reversing
changes made to ced04bb761994616fbdead98130866787772c85a.