This PR adds the `bench` script, which aims for near parity with frappe bench, it makes setting up far easier, because instead of running `./dbench -c "new-site site1.local"` you only white what you would if bench was installed on the local system (i.e. `./bench new-site site1.local`), it also adds other features as well.
* Condensed Dockerfile
Updated to latest node, and uses python-pip, also condensed a lot the Dockerfile.
* Removed extra line
* Removed MAINTAINER in favor of LABEL
* all installs are in one apt command