thrift libraries incompatible with py3k

[fmoo]

Currently, sparts' thrift support depends on apache thrift, which (to my knowledge) does not generate py3k compatible code.

fbthrift's compiler is capable of generating py3k compatible code, but (a) its different command line arguments are incompatible with sparts.thrift.compiler and (b) the fbthrift Python bindings are not appropriately packaged (e.g., on pypi)