Refactor/cleanup build output

This PR changes the structure of the project a bit:

A basic .gitignore file was added
The source that you work on was moved from the project root to lib/gyronorm.js.
The Gruntfile.js was updated to generate 4 files in the dist/ dir:
- dist/gyronorm.js: unmodified copy of lib/gyronorm.js (no dependencies included)
- dist/gyronorm.min.js: uglified/minified version of lib/gyronorm.js (no dependencies included)
- dist/gyronorm.complete.js: all dependencies (es6-promise polyfill, fulltilt) concatenated together with lib/gyronorm.js
- dist/gyronorm.complete.min.js: same as above, but also uglified/minified, this is the same as the old version of gyronorm.min.js
package.json and bower.json were updated to point to the new locations of the right files.

In addition to these changes, this 27785e5fe22be003d07487c9ed870baf0897ae22 fixes a typo that broke everything.

dorukeker / gyronorm.js