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Add Python 3.4 to Travis and tox.
fixup! Fix optionaltags filter to not error when filtering nothing.
Move the sanitizer lists to not be runtime computed, move to sets, reformat.

This will break everything. But the branch is already massively broken.
Sanitizer is a treewalker, so no need to support tokenizer token types.
Change sanitizer test serialization to better match expectation.
fixup! Change sanitizer test serialization to better match expectation.
Update the sanitizer to match against the proper tuples.
Merge remote-tracking branch 'origin/master' into sanitizer-fixes-72