Implements common styles and a basic file viewer

Font Awesome injection in a commit

Pulls in Bootstrap utility and helper classes added in for convenience. Everything namespaced under `.sul-embed-*`

Adds in file count. Assumes that resources only have one file. Created a ticket to understand this model better and try to get examples with multi file resources. #50 

Closes #45 

![screen shot 2014-10-10 at 6 08 24 pm](https://cloud.githubusercontent.com/assets/1656824/4600929/96ee851c-50e3-11e4-8bed-648feeb2ca53.png)


Just a minor idea.  What if we define the stacks_url in the common viewer (probably that just constructs a file URL as that's the default behavior).  The Image viewer could then override this method to provide the /image/ part of the path.