Add verify function to hmac and hashes.
Clean up documentation and naming.
Merge branch 'master' of https://github.com/pyca/cryptography into verify

Conflicts:
	tests/hazmat/primitives/test_hashes.py
	tests/hazmat/primitives/test_hmac.py
Update documentation on interface as well.
Documentation clarity and grammer fixes.
Remove verify from Hash.
Merge pull request #315 from juliankrause/verify

Add verify function to hmac and hashes.