- Also add tests for spacing in param names.

- Stop parsing new templates if the template depth gets above
  MAX_DEPTH (40) or if we've already tried to parse over MAX_CYCLES
  (100,000) templates.
- Add two tests to ensure recursion works somewhat correctly.
- Fix parsing the string "{{" with the Python tokenizer; add a test.

- Add a _SliceNormalizerMixIn to properly handle slices.
- Use floor division when applying key.step.
- Implement sort() without 'cmp' parameter.
- Fix bytes(list) behavior.
- Children of _ListProxies are now _ListProxies, not regular lists.

- Skip CTokenizer tests if CTokenizer is not available.
- TestStringMixin: Don't make assumptions about default encoding.
- Add urllib stuff to mwparserfromhell.compat.
- Fix compat.py's line endings.
- gen.next() -> next(gen)
- assert*Equals() -> assert*Equal()

Still need to do some py3k-only ones.

- Newlines are now allowed in template param names.
- Changes also affect handling of arguments like {{{foo}}}.
- Update unit tests: remove some unnecessary ones, and add some to cover the changes.
- Update StringMixIn tests to actually work for some of the methods.
- Update copyright notices for the C extensions.

Some other changes, including removal of the 'string' import in the tokenizer.

Also, fix parsing of wikilinks in both tokenizers such that newlines
in any location within the title are an automatic failure.