minirst: make encoding.encoding unicodes to pass into encode() and decode()

minirst: make regular expressions bytes

setup: convert setupversion to unicode Something deep in the bowels of distutils expects "version" passed to setup() to be a str/unicode. So, convert the type. This still works on Python 2 because the string is ascii and an implicit coercion back to str/bytes should work without issue. If it does cause problems, we can always make the unicode conversion dependent on running Python 3. This change makes `python3.5 setup.py install` work.