Add font antialiasing to fight jagged fonts, esp. on OSX and light font on dark background
Localize global font-family setting to just 2 places + add Helvetica Neue as primary font
Additions/corrections to font management and rendering
Misspelled `!important`
Address review comments
Merge remote-tracking branch 'upstream/master' into improve-font-rendering

Conflicts:
	widgets/lib/common/spark_widget.css
Address review comments
Merge pull request #2067 from ussuri/improve-font-rendering

Improve font rendering and management