remove the bizzare and un-idiomatic CdataOwner class
Replaced weakrefs with ffi.gc.
removed weakref usage from hmac and hashlib
Ignore doctest parse issues.
Merge branch 'master' into remove-weakrefs
Merge branch 'master' into remove-owner-thing

Conflicts:
	tls/c/__init__.py
Merge branch 'master' into allow-no-padding
py3k fixes