Removing files is now possible but doesn't show the initial message if files length is 0.

#36
Changed the files.processing and files.queue lists to filesProcessing and filesQueue. Also changed the order in which the complete events are called.
The dropzone gets reset now if no more files.

Closes #36
Added all download files.
Upgrading version to 1.3.6
Upgrading version to 1.3.7-dev
Merge tag 'v1.3.6'

Added removeFile() functionality.
Improved the events comment.
Fixed the content type check.

Thanks tienshiao #33
The file is now the last parameter added.

#33
Added the possibility to define additional params.

#30
Added a preparingupload event which can be used to add additional data to each upload.

Closes #42, #30, #33
Decided to ditch the preparingupload event and stick with only a sending event.
Added downloads.
Upgrading version to 1.3.7
Upgrading version to 1.3.8-dev
Merge tag 'v1.3.7'

Added the possibility to add parameters for each file upload.
Added the enqueueForUpload option.

Closes #32. #30
Added a dropzone.disable() call.

Closes #35
Added download files.