No tty when executing a single command

When executing a single command (ssh user@host echo 'hello world') a tty should not be attached.

SSH exec support

Implemented ssh exec support. E.g. ssh localhost -p 2222 ls -al /var/log/apt/history.log

Docker API

Directly use the Docker API to communicate with containers. This eliminates the need of having to map or install the Docker binaries into the container. The only requirement now is that the Docker socket is mapped into the container. It also results in a smaller image (+/- 35 MB)

Alpine

Released new Docker Image based on Alpine. Reduces the image size drastically.