fix regression in add bug to project

the recent feature to allow users to set an owner on an action item
broke the add bug form, which doesn't have that option and so
needs to default to the request.user as the owner.
point all the pages that use tablesorter to the new js path
Merge pull request #39 from thraxil/add-bug-owner-regression-fix

fix regression in add bug to project
Merge pull request #40 from thraxil/tablesorter-fixes

point all the pages that use tablesorter to the new js path
remove lettuce-related files
Introduce django-casper, and add some integration tests

To run the JS tests with `make test`, you need casperjs installed.

On OS X:
$ brew install casperjs --devel

Or anything that has npm:
$ npm install -g casperjs

http://docs.casperjs.org/en/latest/installation.html
use pypi package for django-casper