Add tests for create_sig
Export RSA key to file
More coverage for crypto_util
wording
Merge branch 'logging' into crypto_util_test
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
Fix import grouping
Merge branch 'crypto_util_test' of git://github.com/kuba/lets-encrypt-preview into kuba-crypto_util_test
Remove MakeCSRTest
git push origin masterMerge branch 'kuba-crypto_util_test'
Merge pull request #130 from letsencrypt/challenge_util

Challenge util
Merge branch 'master' into configurator_tests

Conflicts:
	letsencrypt/client/client.py
	letsencrypt/client/crypto_util.py