Upgrading version to 3.3.1-dev
Merge branch 'master' of github.com:enyo/dropzone into develop
Update readme.md
Dropzone.forElement throws an exception now instead of returning null if no dropzone found.

#170
Upgrading version to 3.4.0 (Dropzone.forElement throws an exception now instead of returning null if no Dropzone.)
Merge tag 'v3.4.0'

Dropzone.forElement throws an exception now instead of returning null if no Dropzone.