Dropbox dependency is gone

[iainbryson]

When I do a bower install locally, I get:

bower dropbox#*                                ECMDERR Failed to execute "git ls-remote --tags --heads https://github.com/lavelle/dropbox.git", exit code of #128 remote: Repository not found. fatal: repository 'https://github.com/lavelle/dropbox.git/' not found

(And of course, when you go to the bower site, you get the deprecation warning for Bower as a whole, urgent folks to go to webpack/yarn/npm)