Merge pull request #1 from garaik/feature-activity

Created Activity entity - though it needs one more many to one field wit...
implement difficulty domain
Created Grade and Subactivity entities
message.properties
Merge remote-tracking branch 'origin/master'
add dojo plugin config
Merge remote-tracking branch 'origin/master' into feature-activity

Conflicts:
	grails-app/i18n/messages.properties