Change color to white for tag on (red/orange/olive background)

See
http://www.reddit.com/r/Enhancement/comments/22mg2l/feature_request_white_text_color_for_red_orange/
elementInViewport(): return false if element is falsey
Merge pull request #1042 from matheod/whiteTag

Change color to white for tag on (red/orange/olive background)
utils: Add semicolons for cssPrefix for protection

Per @andytuba's comment on #1060
Merge pull request #1065 from mc10/cssprefix

utils: Add semicolons for cssPrefix for protection
Merge pull request #1049 from bronzle/elementInViewport

elementInViewport(): return false if element is falsey