Added check to turn of CC backend for OS X version < 10.8
Fix drop in coverage levels by removing branches
Removed dependency on setuptools for version check
Fixed python3 incompatibility
Merge pull request #744 from Ayrx/osx-version-check

Added check to turn off CC backend for OS X version < 10.8
Load OpenSSL "traditional" format private keys
Add serialization docs
Unused passwords probably arent ValueErrors
pep8
Update changelog
Better docstring
Raise TypeError when password is missing