Allow server to daemonize (using Daemons gem).
Add a build directory for commander server.

This is where we'll drop off the built tarball(s)
Tweak bin scripts to run with standalone bundle in production

We now use bundler differently (depending on what mode we detect):
* In 'test' mode, we'll run with the systemwide bundler.
* In 'production' we'll deploy with a standalone bundle.

The bin scripts must setup bundler appropriately before loading or
running the commander code (which require the libs in the bundle).

Also fix up runner_spec tests to respect this.
Remove redundant call to bundler setup.

Requiring bundler/setup is sufficient (as per source)
Add rake task to build (package) commander tarball.

Builds the tarball in a tempdir, so that we can run bundler
independent of the workspace (where it prefers to "remember"
settings). We ask bundler to give us a "standalone" bundle so
that we don't rely on bundler being present on the target system
and commander packs up all its gems nicely into its own dir.

The tarball can be unpacked anywhere, and its bin scripts (and libs)
reference each other relatively).