fix example: wrap dict.values in list()

In Python 3, `dict.values` returns a dict_values object, which does not support indexing.

Drop support for EOL Python 2.6, 3.2 and 3.3

Add <wbr> to definitions.py

Added to MediaWiki in ff74113bea (T54468).

Also removed the max cycles stop-gap, allowing much more complex pages
to be parsed quickly without losing nodes at the end

Also fixes #65, fixes #102, fixes #165, fixes #183
Also fixes #81 (Rafael Nadal parsing bug)
Also fixes #53, fixes #58, fixes #88, fixes #152 (duplicate issues)

rewrite and extend Caveats

>not supported, since they cannot be represented in the node tree.
It's not that they cannot be represented, it's that they would have to be evaluated.