exposes an event for file drop
exposes an event for file drop

Emits an event passing in raw `File` dropped
valor-software/ng2-file-upload,seven-cd/ng2-file-upload,seven-cd/ng2-file-upload,albpara/ng2-file-upload,albpara/ng2-file-upload,valor-software/ng2-file-upload,valor-software/ng2-file-upload,seven-cd/ng2-file-upload