add REPL config, help, and document

[jeffbski]

Provide ability to configure REPL via config.

• repl - where to have REPL listen, defaults to env.CLUSTER_MASTER_REPL || 'cluster-master-socket'
  • if repl is null or false - REPL is disabled and will not be started
  • if repl is string path - REPL will listen on unix domain socket to this path
  • if repl is an integer port - REPL will listen on TCP 0.0.0.0:port
  • if repl is an object with address and port, then REPL will listen on TCP address:PORT

Examples of configuring repl

var config = { repl: false }                       // disable REPL
var config = { repl: '/tmp/cluster-master-sock' }  // unix domain socket
var config = { repl: 3001 }                        // tcp socket 0.0.0.0:3001
var config = { repl: { address: '127.0.0.1', port: 3002 }}  // tcp 127.0.0.1:3002

Provide help command within the REPL

Document REPL use

[mcculloughsean]

:thumbsup:

[liamdon]

:+1:

[tellnes]

:+1:

[jeffbski]

Since it had been a long time since this pull request was created and hadn't yet been merged, I finally published my fork in npm as cluster-master-ext so it would be available I npm.

My fork is at https//github.com/jeffbski/cluster-master

[isaacs]

Sorry for the long delay. Landed and published as v0.2.0