DC2B-33: Upgrade AODN Portal from Grails 1.3.7 to 2.1.0

1)  Update the Grails plugins' version to the greatest for Grails 2.1.0.
2) Modify implementation to make the app runnable with Grails 2.1.0.
3) Modify the new test cases.
Merge branch 'master' of https://github.com/IntersectAustralia/aodn-portal