Update version numbers for v3.4.0

Version 3.3.2

Version 3.3.1

Bumped to v3.3.0!

Bumped to v3.2.0!

Bumped to v3.1.0!

setup.py: require lxml 3.0+ for tomcat error messages

* Bumped version to 3.0.6

Update error message string interpolation (closes django-haystack#70)

Python's string interpolation requires a tuple, not a list