fix(app): 404 on Bootstrap Images

[jamierytlewski]

Add lines of code to allow the glyphicons to not have 404 errors.
Followed the standard of the generator-yeoman-webapp for consistency.

[eddiemonge]

shouldnt these come in the bootstrap bower package?

[jamierytlewski]

Maybe they should. I tried to follow the instructions on the http://yeoman.io site for setting up an angular project. The bootstrap images did not show up. I did a setup for a regular webpapp and I noticed the bootstrap images were there. I looked at the differences in the index.js and noticed that the webapp generator copied the images and the angular generator did not. Both generators have the images located in the project, so I'm guessing if the images came with the bootstrap bower package (or placed them in the correct folder), the images would not be in the project.

That's why I proposed this fix. I looked at how the webapp generator generated a project (which showed the images) vs the angular generator (which did not).