[feature] font-awesome-4




**Purpose**
Closes #1204 

**Cause**
Newer OSF pages are written to take advantage of the newest font awesome icon library v4.x. We have two competing libraries in use on the production page, this change eliminates the need for the older version.

**Changes**
A global search and manual replace was performed on the entirety of the OSF code base. Using the following migration guide provided by the library's author icon's were updated from the older font awesome v3 icon names to v4.
https://github.com/FortAwesome/Font-Awesome/wiki/Upgrading-from-3.2.1-to-4

Remove the old font awesome local folder servers: `/static/vendor/font-awesome`

**Side effects**
Double check icon's throughout the site to ensure they are loading properly.