Merge pull request #2 from cchampet/tuttleofx_dev

tuttleofx dev version
Update tuttleofx.rb

* use boost with-python
* use upstream seexpr
* use scons *args
tuttleofx.rb: remove quotation marks
use openimageio from cchampet until PR gets merged
take openimageio from homebrew-science
use ENV instead of export
tuttleofx: update dependencies

* use upstream ctl.