Be able to install new services to the `.bitcore` home node.

[braydonf]

cd ~/.bitcore
bitcore install <service-name>

Edit: And work from any location

[bitjson]

It'd be great to think about quickly installing a service like https://github.com/bitpay/i-made-this into the globally installed node.

Something like bitcore install -g i-made-this could install the service and perhaps even add a shortcut or symlink in the primary Applications folder of the user's OS. Would be an excellent distribution channel for projects like OpenBazaar, JoinMarket, or Lighthouse. Could ultimately be made even easier by a GUI for the globally installed node.