New package: dropbox-cli

dropbox-cli, part of dropbox-nautilus is a small self-contained python
script to control the dropbox daemon.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Fix platform note in dropbox-cli

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Merge branch 'master' into dropbox-py

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>

Conflicts:
	pkgs/top-level/all-packages.nix
Merge pull request #416 from the-kenny/dropbox-py

dropbox-cli: add