Tidying up

Rename "makefile" to "Makefile".

Modify Makefile to allow the location of "rst2html" to be specified on
the command line.

Remove executiable bit on bep_0015.rst.
Initial commit of BEP 41
Initial commit of BEP 41 HTML
Merge pull request #3 from mct/master

BEP 41, UDP Tracker Protocol Extensions