adaptivetheme 7.x-2.2

This is the second maintenance release for Adaptivetheme 7.x-2.x, it includes some important bug fixes in particular for responsive design in older versions of Internet Explorer:

Major bugs for IE:
- move respond.js to the footer to avoid IE8 crashing when an image is set to the body or html element
- disable flexible images for IE8 and below, it can cause images to be invisible

Minor:
- remove forum png and tiling bug (since core now has the right images)
- clean up comments and generally tidy things in the CSS

There are no new features in this release - the 7.x-2.x branch should be considered stable and feature complete. All new features go to the 7.x-3.x branch and back-ported where appropriate and where it does not affect any existing 7.x-2.x user.