Added calls to explicit endpoints for :install, :remove, :close,

:launch, :lock, :shake.

Added conditionally so that, if/when these are added to the standard Selenium library, they don't over-write those.

I'm a little concerned that this PR is overly clever;  I originally was just opening the Bridge and Commands, and delegating from this library's driver to those.  I thought this was the cleanest way to extend that library one command at a time, for each command that's not already there, while still being readable.

Thoughts?