Fix color issues and failing tests

Hey there!

I installed this generator this morning, but noticed it was failing on the `yellow.bold` call at https://github.com/danheberden/yeoman-generator-requirejs/blob/master/app/index.js#L30. 

Even after bumping the dependencies, as suggested [here](https://github.com/yeoman/generator-webapp/issues/137), the error was still occurring, so I used chalk, just as was done in [this commit](https://github.com/yeoman/generator/commit/3c60110). Fixed!

After that, I ran the specs and saw failures. The 3rd and 4th commits in this PR address this, but I'm a little iffy on them. In both of those commits, I couldn't (after a cursory search) track down what repo or change was actually responsible for breaking them (I'm assuming the two specs were passing before?). The fourth commit especially seems heavy-handed, as it just removes error checking, but I did take a cue from the webapp generator where [they only expect an answer object](https://github.com/yeoman/generator-webapp/blob/master/app/index.js#L64) in their prompt.

Happy to help/refactor/whatever, just let me know. Both tests passing locally and generators works just fine for me now on OS X 10.8.4. Thanks!