HQLPARSER-12 Adding Strong's Antlr 3 Gradle plug-in in order to test the new runner with Gradle
HQLPARSER-12 Moving Antlr grammars to folder where expected by Antlr3 Gradle task
HQLPARSER-12 Adding Gradle build files
HQLPARSER-12 Removing Maven POM files; Adapting to ORM's conventions for class output and CheckStyle config directories
HQLPARSER-12 Upgrading Gradle wrapper to 1.6