decode epilog

The epilog.rst file is included in the conf.py. But the data is only read()
without a decode(). This can lead to parse errors. Therefore decoding it to
utf8 is the right way to go.

Signed-off-by: Erik Bernoth <erik.bernoth@gmail.com>
Merge pull request #21 from erikb85/decode-epilog

decode epilog
Merge remote-tracking branch 'jterrace/master' into pub