Implements Tests for AddThis

[doylejd]

Updates

• Adds unit tests for Block, Field and Permissions.
• Resolves several issues found from going through testing
• Does a bit of code cleanup

TODO

• Need to do some abstraction in the tests. There is a lot of duplication that could be cleaned up.
• More tests are needed to get full code coverage.
• Should be able to verify markup on the page, but need to confirm.

[nerdstein]

Hmmm, Controller? It's rendering

[doylejd]

This will be moved as part of another issue. Had to call render() here because of the nature of the nested form options to avoid getting 500 warnings on every load of the admin page.