Install Dropbox and 1Password

Need to install 1Password license manually currently.

Uses Joshua Timberman's data bag-driven workstation cookbook.
He doesn't seem to have this one in an individual repo that
can be managed in the Berksfile at this point, so added it
manually to site-cookbooks.
DMG and home-brew installs for a few basic dev tools
Recipes to install Knox and (almost) HipChat