Add jquery backstretch
remove old full screen bg from header
Merge branch 'master' into redo.fullscreen-bg

* master:
  only reinitialize infinite scroll if we need to.
  wrap all front end scripts in an if ! is_admin
  re initialize infinite scroll in ajax page loading
  correcting conditionals in infinite scroll functions.
  breaking scripts and styles up into individual functions. Broke infinite scroll.
add priority 100 to infinite scroll enqueue
first stab at backstretch script. Not working, but not erroring.
made backstretch thing work, but broke infintiescroll again
add reinitializer for backstretch in ajax_menu thing. Fucked some things up.
fixed reinit of backstretch in ajax menus
cleaning up background colors in style.php
going back to a regular use of header image
remove old full screen background image thing