add binding for openssl `X509_REQ_digest`
Merge pull request #1472 from bwhmather/X509_REQ_digest

add binding for openssl `X509_REQ_digest`
Move the cryptography package into a src/ subdirectory

Due to differences in how py.test determines which module to ``import``
the test suite actually runs against the cryptography which is in the
*current* directory instead of the cryptography which is installed. The
problem essentially boils down to when there is a tests/__init__.py then
py.test adds the current directory to the front of the sys.path, causing
it to take precedence over the installed location.

This means that running the tests relies on the implicit compile
that CFFI does instead of testing against what people will actually
be runnning, which is the module compiled by setup.py.
Use coverage parallel mode and coverage combine to fix paths

When using coverage.py with a project installed into site-packages
instead of in the current directory you end up with paths like
.tox/py34/lib/python3.4/site-packages/cryptography/__init__.py which
is less than ideal (and may cause issues when aggregating coverage
over multiple versions of Python). Switching coverage.py into
parallel-mode will have it write a .coverage.* file instead of a
.coverage file, which can then be "combined" into a .coverage file
using coverage combine. When coverage.py does the combine step it
will collapse the .tox/*/lib/python*/site-packages/cryptography
paths into src/cryptography.
Merge pull request #1468 from dstufft/move-to-src

Move the cryptography package into a src/ subdirectory
Monkeypatch the CFFI Verifier to prevent the implicit compile
Merge pull request #1474 from dstufft/disable-implicit-compile

Monkeypatch the CFFI Verifier to prevent the implicit compile
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)
Upgrade the encryption algorithm on another thing. This uses the same PBES2 parameters as the previous one.

If someone has a choice for a 2nd algorithm, I'm happy to do that. See previous PR for ideas about how to review
Update docs
Merge pull request #1484 from alex/re-encode-thing

Upgrade the encryption algorithm on another thing. This uses the same PBES2 parameters as the previous one.