GPRELEASE-42 Change scope for dependencies to "compile", as "provided" a...

...nd "build" no longer will be resolved by application for plugin dependencies.

Ref http://grails.org/doc/2.2.0/guide/upgradingFromPreviousVersionsOfGrails.html section "Upgrading to 2.2 from 2.1 or 2.0" and http://grails.1312388.n4.nabble.com/legacyResolve-and-dependencies-with-scope-quot-provided-quot-td4641607.html#a4641610