Grid and type changes

@tsmith512 

When you have a chance to review this, please let me know what you think. I'm hoping this will be a much smoother transition to Drupal.

## Key changes
* Breakpoints have been adjusted/removed/redefined based on a mobile-first approach to breakpoint design
* Removed em() function - changed $space variable and type measurement unit to pixels
* Changed footer seal to use suggest background-image SVG over inline SVG

## Still to-to
* Fix ```ul``` and ```ol``` ```list-type``` for drupals
* Refine entity bar and search for mobile


Just for you: I agree, here! :stuck_out_tongue_winking_eye:

Form elements will be sized appropriately for their HTML `size` attribute unless a CSS `width` is specified. I'll warn you that `100%` may be a little huge, but let's tackle that once we have some forms in place, or once you see what it looks like in the Drupal Styleguide.