Document the ``raise_from`` function for exception chaining (PEP 3134)
Add ``future.utils.raise_from`` (issue #86)
Fixes for raise_from()
raise_from(): set __suppress_context__ correctly as per PEP 0415.
Merge branch 'raise_from' into v0.12.x
Add (currently failing) tests for int.to_bytes and int.from_bytes (issue #85)
Add initial attempt at int.to_bytes() and int.from_bytes() (issue #85)
Disable tests for int.to_bytes(..., signed=True) and int.from_bytes(..., signed=True) for now
Fix newint.to_bytes and newint.from_bytes tests to use a newint
Little fix for newint.to_bytes()
Little fix to newint.from_bytes()
Get the remaining newint.to_bytes() and newint.from_bytes() tests passing (issue #85)

(Excluding signed=True)
Merge branch 'int_to_from_bytes' into v0.12.x