Implement DropzoneJs for upload

[pamtaro]

Enhance the UI experience by using this javascript library for uploading files.
There's a gem that wraps it for Rails-
https://github.com/ncuesta/dropzonejs-rails

[jmdembe]

...I think I did this right!

[pamtaro]

@jmdembe where did you commit the changes to?.. did you push it back up to github?

[jmdembe]

I thought I committed the changes last night. I'll see what happened.

EDIT: It appears that I didn't move it off of the branch UserViews 😐