Adds Exclusion Support to Gaze. Fixes GH-7

Add test case for exclusions in Gaze.

Testcase..

Fix test cases on this branch.

Code Review mchoy. Ran local tests, 42 passes. Yay. Tested locally as well using my project, and it worked the way I expected it too. Yay!

Minor fixes.
Merge pull request #2 from jamie-stackhouse/exclusions

Adds Exclusion Support to Gaze. Fixes GH-7