-fixed add_group() and add_skill(). -added functions to locate delete buttons on skills and groups

Added functions to determine if groups or skills were present.

Added tests for adding/removing skills/groups

Added selectors and methods for groups and skills labels

Improved deletion tests to not delete all skills/groups.

Removed extra assignment statement.
Merge branch 'master' of https://github.com/dchunwong/mozillians-tests