added new hover effect: BOUNCE
  * discovered keyframes
  * discovered @content directive for SASS
* Fixed keyframes mixin
* Updated README with code block syntax
added "sticky footer"
  * use padding instead of margins to manipulate inner elements
  *some duplication of code between here and structure.scss, but i'll be keeping it so that I can refer back to the original formatting of the sticky footer
* BUG: the footer will not be pushed down below the content if the content is taller then the viewport height.
* added missing _partial files
replaced ryan fait's sticky footer with a better implementation
  * stays stuck to the bottom even with content that changes size