Brought back Genericons

Removing these just changed the base style too much. We would need to
add them for most of our themes anyway, so I’m keeping them.
Integrate jig-grunt into load-grunt-config

This removes an extra require, which is always nice.
Pulled in Genericons using Bower

Because Genericons is a 3rd party script, we should manage it with a
package manager just as we do for all other dependencies. Fixes #17
Improved pingback/trackback styling
Fixed search button padding
Removed search text from search button
Added entry meta template helper functions
Removed compass_commnets_link
Added flagship meta template tags
Simplified post terms display

Now that we have icons again, this extra text isn’t really needed.