[CMSIMGP-374] Implemented a matte action.
[CMSIMPG-374] Incorporate a simpler matte implementation from codereview
[CMGIMPG-376] Implemented correct size stepping for matte actions, where the target and source ratios are not alike.
[CMSIMPG-374] Fixing some whitespace trailing
[CMSIMPG-374] Fixed a bug occuring when an image is display:none and then transitions to viewing, and is responsive.
[CMSIMPG-374] Fixes for IE8
[JANUS-1006] Removing non-JS IE fixes, since this branch is only to merge the IE fixes.
[CMSIMPG-374] Restore matte implementation. Was removed in JANUS-1006 to deploy only the IE changes
[CMSIMPG-374] Change matte background default to black
[CMSIMPG-374] IE8 bug fixes for event handling