GPII-179: Fixed styling issues with IE8 caused by the fact that IE8 doesn't support html5 tags.
GPII-179: Fixed the IE8 image scaling issue.
GPII-179: Added in PNG fall back to solve the problem that SVGs are not showed in IE8.
Merge branch 'master' into GPII-179 and resolve conflicts.

Conflicts:
	demos/discoveryTool/index.html
GPII-198: Apply "more text" only to article images. Also removed the demands block that supplies the iframe html src.
GPII-198: Removed the constraint on excluding next, previous, thumb up/down icons since they are all outside of the <article>.
GPII-203: fixed stacking issue.

Moved the discovery tool panel higher in the stacking order so that it will be above the more text elements.
GPII-194: Fixed these issues: 1) hovering over preference set text labels does not apply hover effect on associated icon; 2) when hovering over "try something new", the animation plays on all preference icons except "more text".
GPII-198: Get rid of the demands block for adjusting the image selector in moreText enactor.
Merge remote-tracking branch 'cindy/GPII-198'

* cindy/GPII-198:
  GPII-198: Get rid of the demands block for adjusting the image selector in moreText enactor.
  GPII-198: Removed the constraint on excluding next, previous, thumb up/down icons since they are all outside of the <article>.
  GPII-198: Apply "more text" only to article images. Also removed the demands block that supplies the iframe html src.
Merge branch 'master' into GPII-203
GPII-196, GPII-200:
- "More text" now says "Extra Words"
- panel labels are all now lower case
- "Try something…" now uses a hand pointer and the arrow is smaller
- checkmark transition sped up
- selected preferences now appear colour inverted when in contrast modes.
- added RobotoSlab font.
Merge remote-tracking branch 'upstream/master' into GPII-196
Merge remote-tracking branch 'cindyli/GPII-194' into GPII-196
GPII-194: Fixed a bug where the drop shadow doesn't appear when hovering over the label.
Merge branch 'master' into GPII-194
Merge remote-tracking branch 'cindy/GPII-194'

* cindy/GPII-194:
  GPII-194: Fixed a bug where the drop shadow doesn't appear when hovering over the label.
  GPII-194: Fixed these issues: 1) hovering over preference set text labels does not apply hover effect on associated icon; 2) when hovering over "try something new", the animation plays on all preference icons except "more text".
Merge branch 'master' into gpii-196
GPII-196: Drop shadow no longer appears when hovering over the text label.
GPII-196: Fixed arrow size on Try Something New.