Several bug fixes
Temporarily fixed firefox issues by adding more string_replacements, still not a good solution
fixed selector problems in ajax.html
changed default size to be smaller than smallest auto-size
Merge branch 'master' of github.com:brmc/django-media-helper into bug-fixes
Update README.markdown
Update README.markdown
Changed tests to be compatible both with and without tox
Fixed firefox issues.  Now correctly removes host name from background-images
Changed tests to work with and without tox
Updated tests to reflect new default settings
Updated tests to cover new settings
Fixed ajax success callbacks to use selectors defined in settings
Updated readme