Fixing bower.json to not use a URL that would not require git keys.

When bower.json uses "git@github.com:mde/timezone-js.git#v0.4.4" for a dependency, bower cannot install the dependency unless the user has their github ssh keys installed and has already used SSH to connect to github. Using "https://github.com/mde/timezone-js.git#v0.4.4" makes it possible to install the dependency without github keys.