ECB vectors for the IDEA cipher.

Vectors from NESSIE and reformatted for NIST loader.
https://www.cosic.esat.kuleuven.be/nessie/testvectors/bc/idea/Idea-128-64.verified.test-vectors
update IDEA ECB vectors to contain 100/1000 iteration results
add vector source data for IDEA ECB to docs
On the suggestion of @zooko, note that we have not been audited
grammar. an thing.
Merge pull request #395 from reaperhulk/idea-vectors

ECB vectors for the IDEA cipher
add 0.2.2 changelog to master
Merge pull request #725 from reaperhulk/0.2.2-changelog

add 0.2.2 changelog to master
Merge pull request #724 from alex/audit

On the suggestion of @zooko, note that we have not been audited
On OS X, prefer Common Crypto to OpenSSL
flake8
This branch isn't coverable yet
Merge pull request #728 from alex/prefer-cc

On OS X, prefer Common Crypto to OpenSSL
Merge remote-tracking branch 'upstream/master'