Update dependencies and compilation

Minor updates of the package

- Changes in Sass file, to allow user to use gradient as well. Now supports: image, gradient, color, with proper handling...
- Update of package.json, just to keep things up to date...
- Seems like I will also need git tag, to make the bower versioning working (still not done, but I'll run it after this commit)
- Don't ignore src files for npm anymore, because I found myself wanting to use Sass file from node_modules...