add RSA verification support
more kwargs
kwargs and class renames to bring verification up to date
more PKCS1->PKCS1v15
fix docs, port some review comments forward to the new PR
address some review comments
docs language improvement
assert some things
Ignore build/ folder and _cffi__*'s

Former can come from python setup.py bdist_wheel
Latter can come from python setup.py develop
Merge pull request #695 from Ivoz/cffi-ignore

Ignore build/ folder and _cffi__*'s
assert another thing
Merge pull request #675 from reaperhulk/rsa-verification

RSA Verification Support
this is not a buflen, it is an outlen. refs #696
be more pedantic in checking the written size of the digest (refs #696)
Merge pull request #697 from reaperhulk/hmac-fix

Fix HMAC finalize buflen issue
Merge pull request #698 from reaperhulk/hash-fix

Be more pedantic in checking the written size of the hash digest
Fix ":param:" syntax in KDF docs
Trun off linkcheck, it's too noisy. Fixes #652
Merge pull request #701 from alex/disable-linkcheck

Trun off linkcheck, it's too noisy. Fixes #652
Merge pull request #700 from wbolster/patch-1

Fix ":param:" syntax in KDF docs