Removed unneeded "ur" from before an empty string.

This tripped up installation under python 3 a little bit. Not tripped-up
enough to cancel the installation, but it *does* raise a warning.
Add Python 3 classifier
Release 0.8.1
Updated changelog
Merge pull request #16 from reinout/collective.recipe.sphinxbuilder

---

I got an error like this when installing under python 3:

    Getting distribution for collective.recipe.sphinxbuilder.
    warning: no files found matching *.txt
    warning: no previously-included files matching *pyc found anywhere in distribution
      File "..../collective/recipe/sphinxbuilder/docs/conf.py", line 171
        (index, SphinxBuilder.tex, ur,
                                          ^
    SyntaxError: invalid syntax

      File "..../collective.recipe.sphinxbuilder-0.8.0-py3.3.egg/collective/recipe/sphinxbuilder/docs/conf.py", line 171
        (index, SphinxBuilder.tex, ur,
                                          ^
    SyntaxError: invalid syntax

    Got collective.recipe.sphinxbuilder 0.8.0.

It is an error that doesnt break the install, but the fix was easy and straightforward.
Release 0.8.2