Brings the UI more in line with recommendations from 8shapes

Lots of stuff here, but to summarize:

+ Fixes visual aberrations with rounded input boxes (namely, combo boxes and spinners)
+ Makes fonts match between Chrome/Safari/FF
+ Lightens the content header and borders
lets not confuse 'ui' here which in extjs component theming has a different meaning that 'cls' application.  Looks like these are all additional 'cls' details appended and no component 'ui' applications.