ENH: Add hashing
WIP ENH: Add hashing
FIX: Unicode
FIX: Py3k sorting
FIX: Py3k
FIX: Tests
FIX: Fix diff fun
FIX: Fixes
FIX: More conservative default for object_hash
FIX: Fix encoding
Merge pull request #1338 from Eric89GXL/hash

ENH: Add hashing