Prettify success and error messages
Be consistent about where and how to display alert messages
Pass the same title to all templates
Improve readability of template code by:

- Reducing line length where sensible
- Making formatting more consistent
- Increasing vertical space between logical units (e.g. divs)
- Reordering elements in <head>
Add meta tag for enabling Bootstrap responsive features as explained
here: http://twitter.github.com/bootstrap/scaffolding.html#responsive
Add class and method-/function-level docstrings to non-test code
Add class and method-level docstrings to util_tests.py module and
update individual tests to conform to their docstrings
Make sure tests for utility functions use upload directory defined in settings.py
Add class and method-level docstrings to validator_tests.py module
ValidatorTest.__delete_uploaded_files is a class method, so change the
name of its first argument from 'self' to 'cls'
DRY: Put code that builds 'results' URL for ViewTest.test_analyse_view in separate method
Add class and method-level docstrings to view_tests.py module and
update individual tests to conform to their docstrings
Fix formatting in settings.py and validators.py: Keep lines to 78
characters or less
Fix formatting in validators.py: Remove space after opening
parenthesis of function call
Refactor: Make extension validator more generic
Remove obsolete comments from urls.py module
Add empty models.py to make sure Django does not complain about it
being missing when running the test suite