Update dependency versions.
Extract the AsynchronousMailProcessService
Removed GPars for compatibility with Grails 2.0.0. Make the service AsynchronousMailProcessService non transactional. Transactions are evil because can be rolled back on error and message can be sent many many times. Fixed tests for Grails 2.0.0.
GPars
Merge branch 'master' into version_1.0-RC7

Conflicts:
	grails-app/conf/BuildConfig.groovy
	grails-app/domain/grails/plugin/asyncmail/AsynchronousMailMessage.groovy