Merge branch 'release/0.7.2' into develop
Convert to PEP 3110 style exception catching

Moves minimum Python version to 2.6
Merge pull request #22 from stefanw/python-3

Convert to PEP 3110 style exception catching
Added a note to the README that Celery>=3.1 is not supported right now.
Merge pull request #25 from thedrow/patch-1

Added a note to the README that Celery>=3.1 is not supported right now
Add countdown for indexing to start