Provides classes for new "connect" and "scale" installers. Fixes #2.

This provides classes to setup various devices. For backward compatibility with older versions of `puppet-fitbit` specifying `include fitbit` will still setup the installer for the Fitbit Ultra. Also added some aliases for consistency.

I'm neither a ruby nor puppet expert, so i'm not entirely certain if the spec classes I've added are sufficient for testing (guidance welcome). I can say that `include fitbit::force` successfully included the "Fitbit Connect.app" for me.

Perhaps @mxie and @sporkd could test and report back?