modify RSA numbers loading to match elliptic curve

fixes #1111
add new DSABackend interface methods for loading numbers
update test to cover missing line
Merge pull request #1155 from reaperhulk/fix-1111

modify RSA numbers loading to match elliptic curve
Fix x509_vfy.py comment style
Fix ssl.py comment style
Fix rsa.py comment style
Fix x509.py comment style
Fix aes.py comment style
Fix evp.py comment style
Make the evp.py comment a full sentence
Fix cms.py comment style
Fix nid.py comment style
Fix err.py comment style
Fix common_cryptor.py comment style
Fix dh.py comment style
Fix dsa.py comment style
Merge pull request #1165 from lvh/slashterisk-comments

Slashterisk comments
Merge pull request #1164 from reaperhulk/dsa-numbers-loading

add new DSABackend interface methods for loading numbers
add DSAWithNumbers subinterfaces