Upgrading version to 3.5.4-dev
Using extensions as accepted files is now possible.

Closes #182
Added the possibility to upload multiple files in one request.

Closes #181

It is untested right now. Tests will follow.
Adapted tests for the new multiple upload behaviour.
Fixed all tests.
Added download files.
Added an enqueuFiles() method with tests.
Added download files.
Added tests for fallback form name.
Added tests for multiple upload canceling.
Added complete tests for the new uploadMultiple behaviour.
Added download files.
Cleaned up the way event handling works for multiple uploads.
Added download files.
Removed the enqueueForUpload option and introduced the autoProcessQueue option instead.

#changelog #189 190
Added download files.
Including radio button along with checkbox when serializing the form. Closes #193
Unselected radio buttons aren't submitted anymore.

#changelog Added tests.
Added download files.
Upgrading version to 3.6.1-dev