#265719 by kkaefer, JacobSingh, ksenzee, and rfay: Fixed CSS aggregator produces invalid code and directory names for @import files which breaks IE (with tests).

#606526 by axyjo and scor: Remove trailing whitespace and add newlines at end of files. Sorry, folks! But it is after code freeze. :)

#472820 by rfay, Rob Loach, and catch: Fixed improper whitespace removal/invalid CSS from drupal_load_stylesheet_content() (with tests).