Updated Icons, Cleaner Nav Bar

Two big UI improvements have landed in Allura's master branch recently.

First, we've removed the icons for each tool (wiki, discussion, code, etc). The icons looked dated, and cluttered the project navigation bar. They also presented challenges of what tool icon to use when a new tool was added. So now they are gone, and the project nav bar in particular looks much cleaner:

Nav bar screenshot

Second, and even more exciting, is the use of Font Awesome icons throughout Allura. They replace a small custom icon set that had limited choices and was fixed-size. Font Awesome has lots of choices and looks great on high resolution screens:

Icons screenshot

Hope you enjoy a nicer looking Allura!