Fix up gear command, Dockerfile, Vagrantfile
Handle systemd/docker build
Remove old build_selinux script
Finishing touches: project fixup
Move switchns and gear-auth-keys-command to cmd/
Add instructions to README
Factor out shared code from gear command
Improve readability in cmd/gear/commands.go
Merge pull request #89 from pmorie/fixup

Fixup
Added basic container create/destroy integration tests
Wait for container to transition to running state.
Added restart and start/stop tests:
 * Added support to list containers and force kill containers to docker util library
 * Moved test container cleanup to suite teardown to avoid race conditions
 * Few bug fixes in tests
Test stability fixes:
* Added systemd based wait for container state change in additon to docker state change
* Reorder tests (to match order of container ids)
* Added "gear status" test