Miscfixes

Fixes the path of getKeyLocation and two character encoding issues. The first one deals with encoding the messages to MIME for the email client, the second one with decoding the headers of the messages sent in MIME format from the email client to Bitmessage.

For a reference on the latter, see e.g. http://stackoverflow.com/questions/7331351/python-email-header-decoding-utf-8