GRADLE-902 Adds support for ANTLR v3 and v4.
Reconciled outdated dependencies.gradle with current version.
Allow for custom ANTLR arguments on task.
Removed explicit variable initialization.
Configure the antlr configuration to be used by default by all antlr tasks.
Merge pull request #1 from alkemist/antlr-convention

Configure the antlr configuration to be used by default by all antlr tasks...
Added integration tests, still includes classpath wrapping in mock build file.
Merging initial integration tests.
Rework Antlr integration to not require a compile or runtime dependency on Antlr for Gradle.