Update HTML5 shiv conditional reference

Addresses https://github.com/SU-SWS/open_framework/issues/84
adding PNG for search icon with transparency. Removing hover image, going to use opacity instead.
Added css/open_framework_print.css file and changed info file to add open_framework_print.css
Adding preprocess function to add search button icon and styles
Merge branch '7.x-2.x' of https://github.com/SU-SWS/open_framework into 7.x-2.x
Merge pull request #94 from rwinikates/7.x-2.x

Update HTML5 shiv conditional reference
by mistermarco: Closes #96 - add dropdown menu classes to menus in navigation region
Merge pull request #97 from mistermarco/7.x-2.x

by mistermarco: Closes #96 - add dropdown classes to menus in navigation
by mistermarco: #96 - adding the hardcoded main_menu back
Merge pull request #98 from mistermarco/7.x-2.x

by mistermarco: #96 - adding the hardcoded main_menu back
Open Framework updates from main project.