Fix dependency issue with groovy version.
Allow for non-forked execution of grails based on configuration property.
Add logback to list of valid logging jars.
Remove useless exception creation in log.
Abstract common functionality and officially support non-forked runs.
Handle version sync for all forms of execution, and remove maven deps from forked class.
Create metadata file if none exists.
Update app.name and app.version even if they're missing from the properties.
Remove groovy-all version from pom.
Remove logging.
Merge pull request #49 from DealerDotCom/master

Fix groovy version error and add support for unforked grails runs.
Download plugin dependencies from specified repos instead of central (issue #50)
Merge pull request #55 from YuryKovalev/master

Download plugin dependencies from specified repos instead of central