Disabled use of MCJIT for now. It was causing a strange crash when the user would render then recompile.
Fixed a bug when loading vertex colors from Blender. Also add Gideon functions for accessing float attributes.
Added float4 attribute function.
Added new sampler to support various sample pattern generation methods.
Removed test OIIO code from test_main.cpp.
Initial support for OpenImageIO-based texture lookups.
Added Gideon functions to allow support for texture filtering.
type::initialize() and type::create() no longer return a typed value. The 'this' pointer is const, which caused problems if a type wanted to create a value with it's own type.