Calls _updateMaxFilesReachedClass after File.accepted has been set
Adds `maxfilesreached` event
Fixes when the maxFiles has already been reached
Fix drag and drop uploads from chrome download bar
Change conditional syntax to be valid CS
Merge remote-tracking branch 'abambom/fix-chrome-download-bar'
Dragging files from Chrom download bar is now supported.

Added source information.

#changelog
Introduced the maxfilesreached event.
Fixed a bug where the .dz-max-files-reached might not be set properly.
Fixed a problem with the image creation in latest Chrome versions.

#changelog closes #226