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
Merge remote-tracking branch 'cindyli/GPII-179'

* cindyli/GPII-179:
  GPII-179: Added in PNG fall back to solve the problem that SVGs are not showed in IE8.
  GPII-179: Fixed the IE8 image scaling issue.
  GPII-179: Fixed styling issues with IE8 caused by the fact that IE8 doesn't support html5 tags.