Updated Python build to reflect the latest changes in Halide code.
All tests run.
Not all the example apps run.
Added missing libpng-config call in the example build command lines for OS X in tutorial07 and tutorial09
Python bilateral_grid parallels the C++ version and works with jit. gpu performance bad at this stage.
Python bilateral_grid generates identical code to the C++ version
Python local_laplacian example app now operational.
Extra comments to bilateral_grid app.
Python interpolate example app exact port of the C++ version and
operational.
Port to lastest master
Merge pull request #292 from fcr/master

Updated Python Bindings