Add missing dropbox dependency in package.json and update bundledDependencies
Add missing dropbox dependency in package.json and update bundledDependencies

The branch build passed on Travis due to caching of the "dropbox" module
under the old name - and a lack of tests for the Dropbox VFS itself.

robertknight/passcards,robertknight/passcards,robertknight/passcards,robertknight/passcards