added imgproc library, upgraded orientation -- still need square root support from darkroom
Merge branch 'verilog' of https://github.com/jameshegarty/darkroom into verilog

Merged with verilog branch to get square root (darkroom.sqrt) functionality.
improved orientation code (angles do not work right now), added imgproc.t library
Merge branch 'verilog' of https://github.com/jameshegarty/darkroom into verilog

Merge so I can commit my changes