Upgrades

Upgrades
========

![upgrades](https://cloud.githubusercontent.com/assets/131831/3990997/0825fb6c-28d9-11e4-947a-120d03236898.png)

* Adds ability to have tooltip variations (needed for an inverse variation seen below)
* Uses currentColor for tooltip tip so we don't need to provide direction related mixin a color variable
* Fixes a bug where tooltips don't remove titles
* Removes Gemfile cruft (as per @andrewk's asimov-forms cleanup)

Inverse looks like:

![inverse](https://cloud.githubusercontent.com/assets/131831/3991014/53263456-28d9-11e4-8b4e-c3a4be586817.png)

Still needs some edge detection it seems? :disappointed: 
Probably worth adding a comment to explain this value