Fix the equals method for RecordKey. Forgot to make this change in the just
submitted patch. Added tests for it, and organized other tests in suites.

Patch by: amitmanjhi
Review by: rjrjr (tbr)

Review at http://gwt-code-reviews.appspot.com/766801


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8533 8db76d5a-ed1c-0410-87a9-c151d255dfc7