Ignore the sections of the NIST files
Removed some tests that are now duplicates
Merge pull request #242 from alex/ignore-nist-sections

Ignore the sections of the NIST files
GCM test vector loaders + tests
fix for py3 bytes in tests
cleanup tests, rename to nist_gcm
improve formatting of dicts in test
merge gcm nist loader and regular nist loader
remove default fail value, update tests