Updated bower.json to allow font-awesome to be properly injected

[brandonsherette]

When building out my example app, I noticed that font-awesome was not being injected into index.html.

So, I Updated _bower.json to allow font-awesome to be properly injected during bower:css and build:css.

[bbodenmiller]

Can confirm this fix works for me. /cc @johnpapa This can close both https://github.com/johnpapa/generator-hottowel/issues/164 and https://github.com/johnpapa/generator-hottowel/pull/189.

[dashawk]

Why is this is still not merged?

[johnpapa]

ty