Add a simple spec to verify sauce options are being added into the desired capabilities

See #100
Add bundler generated gem skeleton
Refactor the sauce-connect code out into a separate sauce-connect.gem

This bumps the minor version across all gems to 2.3, due to the change in the
dependency structure. Chances are this isn't going to affect many folks, or at
least not enough to where I feel comfortable with a jump to 3.x

Fixes #102