GPRESOURCES-212 - tag r:style (like the r:script tag)
Factor out statistics management.
Rename test to avoid double negative. Add some JavaDoc comments.
GPRESOURCES-213 - allows custom writers/types for the stashing feature
Merge remote-tracking branch 'pjungermann/feature_style-tag' into develop

Conflicts:
	test/integration/org/grails/plugin/resource/ResourceTagLibIntegTests.groovy