Merge pull request #16 from est77/est

Small changes in appleseedROP.otl, added backup otls to gitignore.
Added some code for velocity blur and an initial start with partitioning geometry based on geometry types.
Merge branch 'master' of github.com:appleseedhq/houseed
Added copyright and license text.
Ugly fix for veloctiy blur sampling.
Fix for velocity blur.
Adjustments to UI interface of osl2ot.py plus graceful exits when files do not exist.
Several fixes to osl parsing script. Added fix for the output keyword on osl parameters.
Update README.md
ROP improvements.