Update the license header for every source file, as well as the documentation.

Fixes #1209
Merge pull request #1476 from alex/license-shenagins

Update the license header for every source file, as well as the documentation.
Improved the interface docs for DSA and ECDSA signatures
Describe teh format of the result of signer.finalize(). Fixes #1479
update ignores for new project structure
Merge pull request #1477 from alex/improve-docs

Improved the interface docs for DSA and ECDSA signatures
Merge pull request #1480 from alex/document-in-more-places

Describe teh format of the result of signer.finalize(). Fixes #1479
Merge pull request #1482 from reaperhulk/update-ignores

update ignores for new project structure
Re-encrypts one of our vectors from a truly atrocious algorithm (single DES, MD5) to a PBES#2 based one (PBKDF2HMAC + AES)

Refs #1390
Merge pull request #1483 from alex/upgrade-cipher

Re-encrypts one of our vectors from a truly atrocious algorithm (single DES, MD5) to a PBES#2 based one (PBKDF2HMAC + AES)
Merge branch 'master' into pure-python-pem
General forward progres