* Production: Multi-stage Dockerfile.
* Production: Adds VERSION ARG to specify the lbrynet version to download.
* Compiler: Adds REPO ARG to specify alternate git repository to build from.
* Fixes checkmount arg passing.
* Adds correct binding IP address to start.sh
* Adds mountable config to start.sh
* Does not yet add any Layered Config like #70 (it's harder 'cause yaml)