Consider deprecating this gem in favor of font-awesome-rails

In an effort to avoid community confusion, I'd like to propose deprecating this gem in favor of [bokmann/font-awesome-rails](https://github.com/bokmann/font-awesome-rails). 

**Reasons:** The font-awesome-rails gem...

* tracks Font-Awesome core very closely.
* has a test suite
* works with Rails 3.2 and Rails 4 
* works when fonts are stored on a CDN (like CloudFront)
* doesn't require sass or less, but 
* still works with sass imports (though if you're using Rails 4, you'll need to track sass-rails master at the moment)

I think this is all especially important, because Font-Awesome core dropped sass support which will make it much harder to keep this gem up to date. Consolidating everyone's efforts into one canonical rails engine is also a win.

font-awesome-rails is basically a drop-in replacement, but with some extras. However, one thing it lacks that this gem has is helpers. I like the idea of having some helpers, and am planning to add a proposal to add some to the font-awesome-rails gem.

If you're open to this, I suggest:

1. Clearing out the repository, but
1. Leave just a README with a pointer and explaination that font-awesome-rails should be used instead.

(I'm happy to submit a pull-request with this deprecation to save you time.)

Thoughts?