Thrift: Native-code Binary Protocol encoder.

Thrift: Native-code Binary Protocol encoder.

Summary:
Merging a patch from Ben Maurer.
This adds a python extension (i.e., a C module) that
encodes Python thrift structs into the standard binary protocol
much faster than our generated Python code.

Also added by-value equality comparison to thrift structs
(to help with testing).

Cleaned up some trailing whitespace too.

Reviewed By: mcslee, dreiss

Test Plan:
Recompiled Thrift.
Thrifted a bunch of IDLs and compared the generated Python output.
Looked at the extension module a lot.
test/FastBinaryTest.py

Revert Plan: ok

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665224 13f79535-47bb-0310-9956-ffa450edef68