Move ui-tests to tests project.

* Remove old in-app tests.
* Rename the ui-tests project to just "tests".
* Move the UnitTests to the test project so assets can be added to the unit tests without having to add them to cocos2d library. (Assets used for testing CCFileUtils, loading stuff, etc). For an explanation of why this is necessary, see: http://stackoverflow.com/questions/1879247/why-cant-code-inside-unit-tests-find-bundle-resources

Note that any XCode project changes will be hard to merge. Sorry. For this reason, this entire pull request is organizational.