Merge pull request #7 from jeyraof/master

replace summernote.min.js to fix on wrong operation on firefox
Update summernote SOURCE information
Add test
Update to 0.3.4
Prepare tox / travis test
Add travis badge on README.md
Add jquery File Upload plugin
Add attachment backend
Remove 'drag here' div
Update README.md
Support image dropzone and insert an image via url
Fix minor bugs on setup.py and MANIFEST
Fix reverse url error on django 1.4
Update README.md
Fix url bug Django >= 1.5
Fix overriding editor style via widget attributes
Update README.md
Change the type of 'attachment_storage' to class, not an instance
Fix bug
Use a string type 'attachment_storage_class' to pass custom storage class