Updated README.rst file.
Proboscis now works in Python 3!

* Fixed Proboscis code to work in Python 3.
* The unit and examples tests seem to work in both Python 2 and
  3 now.
* This commit may have fixed a bug which happens when Nose
  is not used and an error occurs.
* Added a script which runs the unit tests which hadn't yet been
  checked in.
* Moved tests/examples directory to examples directory to get not have
  to use a import path hack which didn't play well with Python 3.
Updating version.
Adding Pyton 3 to the tox test battery.
assert_raises now returns the exception.
Merge pull request #26 from TimSimpsonR/1.2.6.0

1.2.6.0