Add box property type handler
Removed printlines. Need to add all box properties.
Remove fixmes
Small cleanup of box-handler. Added test.
Got rects with calcs working. Need to generalise the regular expression
Found a regexp that works with calcs that include brackets.
Should try to combine the two box regular expressions.
Combined two regexps
I finished off test for box-handler
Clean up test
small changes
Tiny change
Fix linter errors
Linter errors
Ran grunt
Merge pull request #142 from rjwright/BoxHandler

Add handler for box properties (i.e. clip)