Fix underline on footer buttons, increase readability of splash page/search bar buttons

![screenshot_20140524_114329](https://cloud.githubusercontent.com/assets/1895116/3074919/310ab7e4-e35a-11e3-9e8c-e7aa8aacc2ec.png)
![screenshot_20140525_103016](https://cloud.githubusercontent.com/assets/1895116/3077198/1f1ee36a-e419-11e3-9795-a056f8811cae.png)
Removes those little lines, a result of the default a:hover of bootstrap having text-decoration:underline


![screenshot_20140524_113901](https://cloud.githubusercontent.com/assets/1895116/3074897/b851169a-e359-11e3-88c3-4e18a56cb2d6.png)
In addition, this button's hover state is pretty difficult to read for those with any vision/processing issues. This branch changes the grey to the light purple used elsewhere (#8377af).


![screenshot_20140524_113856](https://cloud.githubusercontent.com/assets/1895116/3074914/e0c7cdb2-e359-11e3-94b4-a7b2c6546b3f.png)
Lastly, the text in the splash page's Search Current Location button completely disappears on hover- changed this to give just this instance of the button the same light purple (#8377af) background on hover.

The buttons will now look like this on :hover 
![screenshot_20140525_102937](https://cloud.githubusercontent.com/assets/1895116/3077606/ee528808-e437-11e3-9591-67deca825c87.png)
![screenshot_20140525_102933](https://cloud.githubusercontent.com/assets/1895116/3077607/ee5370b0-e437-11e3-9c30-6d91c5bb9821.png)