Integrate font size picker

@stulees @mmeiers @dlugo00 Please review the font size picker component that has been added to the Text Widget in this Presentation - http://goo.gl/OsV33b. 

Just as with the font picker, putting your mouse over a block of text will not update the font size drop-down to show the appropriate size. I'm hoping that this is not critical and is good enough for a first release.