Make help flags display .help from nomnom

[Frijol]

Each command in tessel-2.js has a .help option, e.g.:

parser.command('push')
  .callback(function(opts) {
    // true: push=true
    controller.deployScript(opts, true)
      .catch(function (err) {
        if(err instanceof Error){
          throw err;
        }
        tessel.logs.warn(err);
        process.exit(1);
      });
  })
  .option('name', nameOption)
  .option('entryPoint', {
    position: 1,
    required: true,
    help: 'the entry point file to deploy to Tessel'
  })
  .option('verbose', {
    flag : true,
    abbr: 'v',
    help: 'choose to view more debugging information'
  })
  .help('Deploy a script to memory on Tessel and run it with Node whenever Tessel boots up.');

They're not really being used. When you call tessel push -h, it should print out Deploy a script to memory on Tessel and run it with Node whenever Tessel boots up.. But instead it just gives you the generic Usage: t2 <command>.

This should work on flags, too, e.g. tessel push -entryPoint -h should print the entry point file to deploy to Tessel.