Enabling all of the tests now that they're all passing again.

Summary: rT2f0acdb8d1bf fixes the issue with the offset bug, so we can now re-enable all of the tests since they're all passing again.

Test Plan: Apply the patch, modify a file in the Tychaia.ProceduralGeneration assembly (just add a comment) and run `arc unit`.  All of the tests should be passing and none should be skipped.

Reviewers: Sabre070, jrhodes

Reviewed By: jrhodes

Maniphest Tasks: T38, T7, T16

Differential Revision: http://code.redpointsoftware.com.au/D22