Process curve name when loading EC keys. Fixes #1336
learn to pep8
CURVE_TYPES back to private, removed unneeded point creation
add curve name parsing to public key loader
fix indentation
use NID_undef instead of literal value
Merge pull request #1346 from reaperhulk/fix-pkcs8-ec-load

Process curve name when loading EC keys. Fixes #1336
add EC WithNumbers interfaces and docs
Support EC WithNumbers on OpenSSL backend + tests
fix naming mistake in the docs (for DSA and the new EC docs)
refactor to use ctx manager and share logic with set_public_key_affine
fix invalid dict reference in test