Added an "excludes" option so that certain resources can be excluded from cache processing based on Ant-style expressions.
Clarified the excludes option in the README.
New unit test to test the exclusion filter.
Updated this empty test to Grails 2 style.
Changed HSQL to H2 so the tests would run.
Upgraded Grails version.
Merge pull request #1 from azhawkes/master

Added grails.cached.resources.excludes