Pulled In Additional Fixtures for Travis CI

I've finished porting all of the tap tests in *npm/npm* to use the npm-registry-mock. I had to add two more fixtures to get everything working properly:

`async` at 0.2.9, 0.2.10.

and

`checker` at 0.5.1, 0.5.2

Once we get these pulled in, and have a solution to https://github.com/npm/npm/pull/4663, we should be good to go with Travis.