Prepare for 0.94

[akrabat]

Updates for releasing rst2pdf 0.94.

I've set up a test at https://test.pypi.org/project/rst2pdf

You can test the version on Test PyPI using:

$ pip install --index-url https://test.pypi.org/simple/ \
    --extra-index-url https://pypi.org/simple rst2pdf

Items complete:

• Improved long_description so that's it's more friendly on PyPI
• Remove tag_svn_revision as it's obsolete
• Added six and smartypants as dependencies in setup.py so that it works in a clean Python environment
• Remove Pillow dependency as it's provided by ReportLab now
• Updated requirements.in & requirements.txt
• Updated the project's url to rst2pdf.org
• Updated setup.py's author and author email to be generic as it must be a valid email when creating a dist file
• Updated the version number - the date'll in Changes.rst will need updating upon release.
• @ralsina has sorted out @akrabat's PyPI permissions
• Ensure CHANGES.rst covers all changes
• Merge @lornajane's manual building PR
• Update manual version number
• Check manual metadata such as URLs and email addresses, etc.
• Create a release-process.rst document explaining how to do a release so we don't have to re-learn for next time…

Items to do:

• Release 0.94!

[akrabat]

Rebased against master

[akrabat]

@ralsina, @lornajane, @oz123: Would appreciate a once over of this PR.

There's quite a few bits and bobs in here.

[ralsina]

LGTM :-)

[akrabat]

Added rst2pdf version and manual revision number to the Subject field in the manual PDF on the website. I don't know if we'll need it, but it may be handy for support if someone is referencing an out of date manual.