Unskipping the lid driven cavity test.

Cleaned up input file a bit: doing less timesteps for the sake of test speed.

Adding a gold file.

Refs #2708.
Merge pull request #2707 from jwpeterson/lid_driven

Unskipping the lid driven cavity test.
Merge commit 'c801bcb4497d9e8be7a2d2a7d70a5c2e296c0bd0'