virtualenv python2 (fixes #120)
Add tests for create_sig
Export RSA key to file
More coverage for crypto_util
wording
Merge branch 'logging' into crypto_util_test
Refactor dvsni challenge to allow other configurators to reuse code
Merge remote-tracking branch 'github/letsencrypt/master' into crypto_util_test
More tests for crypto_util
Remove csr_matches_names.

c.f. #127 and
https://github.com/letsencrypt/lets-encrypt-preview/pull/127#discussion-diff-21613376
Add tests for b64_cert_to_pem
Add tests for make_key
docs: logger -> log
Merge pull request #128 from kuba/docs

docs: logger -> log
Add unit test for challenge_util
Integrate rising test coverage requirement
Fixed up remaining pylint errors
Fix import grouping
Merge branch 'crypto_util_test' of git://github.com/kuba/lets-encrypt-preview into kuba-crypto_util_test
Remove MakeCSRTest