Fixing GPREST 6-7.

Upgrading to Grails 2.2.2
Fixing the no klass for *RestGrailsPlugin*
Removing tests that are no longer applicable. Need to revisit coverage
for this plugin.

[ticket: GPREST-6]: https throws No such property: klass for class: RestGrailsPlugin
[ticket: GPREST-7]: REST plugin 0.7 uses HTTPBuilder 0.5.1 which has a bug with encoding query parameters.
Merge branch 'hotfix/JIRA-GRAILS-6'
Merge branch 'hotfix/JIRA-GRAILS-6' into develop
Releasing 0.8

Fixes:
GPREST-6
GPREST-7