Minor bug fixes and enhancements.

Bug fixes, added the Dropzone.confirm method and Dropzone.maxFiles(!).

Added a remove file confirmation dialog, and a few bugfixes.

Bugfix for getRejectedFiles() and additional tests.

Introduced autoProcessQueue as well as uploadMultiple.

Added folder upload.

Fixed IE10s InvalidStateError bug.

Fixed travis tests

Added the addRemoveLinks option. Lots of improvements.

Fixed Firefox progress update problems and travis.