Update src/watson/backends.py

CREATE OR REPLACE watson_searchentry_trigger_handler function to avoid problems with broken install.s
Merge pull request #11 from SimonGreenhill/patch-1

Update src/watson/backends.py
Replaced occurrences of `unicode` with django's `force_unicode` to prevent utf-8 decoding errors
Merge pull request #13 from dfunckt/fix-unicode

Replaced occurrences of `unicode` with django's `force_unicode` to prevent utf-8 decoding errors
Added Django>=1.4 compatible django.conf.urls imports to prevent a deprecation warning
Merge pull request #14 from akaihola/master

Fix DeprecationWarning in Django 1.5
Python 3.3 compatibility: fixed what 2to3 complains about, also changed force_unicode to force_text.
Fixed missing module name.
Added `templates/watson/includes/*.html` to `setup.py`.
Fixed unicode errors in JSON tests under python 3.3
Added from __future__ import unicode_literals, print_function every where except migrations/
Merge pull request #18 from tsufeki/python3

Python 3 compatibility
Using a batch size of 100 for bulk search entry updates.
replacing simplejson
Mergin pull request from SimonGreenhill
Bumping version number
Updating changelog
Advertising Python 3 support in setup.py
Updating download URL
Setting up watson for testing with Travis CI