Merge pull request #296 from jgoleary/master

fix field spec format for canonical_test_matching
document randomPairs, randomPairsMatch, and frozendict close #298
simplify frozendict hash
2.6 compatibility
Removed AsciiDammit
escape zope.index operators, closes #299
Update requirements.txt
Delete dev_requirements.txt
Update README.md
Update .travis.yml
Update .travis.yml