Updated setup.py into version 0.1

Temporarily remove the long_description, docutils were having some problems
with it.
Automatic coversion from .md to .rst

The Python package index doesn't support the .md format, this way it gets
automatically converted to .rst before it gets uploaded there.
Provide info about exceptions in context.

Info about them gets saved into `context['_taskrunner']['run_failures']` and
`context['_taskrunner']['cleanup_failures']`.

Resolves #8