Bug: Missing heading when using rst sources with lonely 1st level heading

[gchriz]

Hi!
When I'm using rst sources with a 1st level heading that is occuring only once in the document the underlying docutils treat that heading as title.
As such it is not included in the parts['body'] that is used in renderers.py and so it's not in the output wok creates.

Example:

heading1
========

some text

heading2
--------

more text

gives (shortened):

<p>some text</p>
<h1>heading2</h1>
<p>more text</p>

Using parts['html_body'] instead makes it appearing, but an even better solution might be to disable this docutils behaviour by:

overrides = {'doctitle_xform': False}
return docutils.core.publish_parts(plain, writer=w, settings_overrides=overrides)['body']

Here the corresponding commit in my wok fork, including some more documentation:
gchriz@ddaf7df

[gchriz]

Now I made that fix configurable.
For backwards compatibility and for users who might need the old behaviour:
gchriz@cb47b5d

[gchriz]

After doing some "git for dummies" I finally managed to create my first pull request here (#152).
As far as I understand Travis is happy with it too.