[issue29869] Underscores in numeric literals not supported in lib2to3.

[Nevada Sanchez]

Nevada Sanchez added the comment:

The existing regular expressions weren't actually strict enough as is, so I made them even more correct. In particular, we must have at least one digit following `0[xXbBoO]` and must be before any underscores.

I have a small set of test cases to examine correctness of these regular expressions: https://gist.github.com/nevsan/7fc78dc61d309842406d67d6839b9861

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<http://bugs.python.org/issue29869>
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