Upgrade wrapper to 1.7.
Compile with groovyLocal to avoid problems when running tests in eclipse.
Tweaks to run in gradle 1.7.

Pass CopyActionImpl Instantiator instance.
Change visitFile and visitDir method signatures to override EmptyCopySpecVisitor methods
Merge pull request #47 from AlanKrueger/master

Upgrades to work with Gradle 1.7