#24: Fixed several problems with grouped styles and stateful styles
Removed sample.mss.  Not needed since styles were finished.
Fixed some non-functional problems with test files
#2: Finished border layout.

The test seems to have a problem with rendering.  I'm 95% confident that the border layout itself is working as intended, but some of the components in the test just aren't rendering.  Need to figure this out before I close the issue.