Fix underline on footer buttons, increase readability of splash page buttons

![screenshot_20140524_114329](https://cloud.githubusercontent.com/assets/1895116/3074919/310ab7e4-e35a-11e3-9e8c-e7aa8aacc2ec.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 a darker shade (#bbb).

![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 a grey (#bbb) background on hover.