Update bower.json's main to conform to Bower's spec. #57

Fixes #57 

* Update `bower.json`'s main to conform to Bower's spec. Per https://github.com/bower/bower.json-spec, "main" should "not include minified files."

* Replace `ng-clip.js` symlink with actual file. Necessary in order for `ng-clip.js` to come down when fetched via Bower.