Allow additional parameters to be passed to Casper, these can then be accessed from Casper using the Casper cli module.

Allows named or anonymous parameters, but doesn't yet deal with both.  The following grunt config:

ghost: {
  dist: {
    src: ['test/casperjs/**/*.js'],
    options: {
      direct: true,
      printCommand: true,
      args: {
        foo: '7071'
      }
    }
  }
}

would run 'casperjs test/casperjs/frontend.js test --direct --foo=7071'

Within Casper you can get the value of foo with 'casper.echo(casper.cli.get("foo"));'  If args is an array, unnamed arguments will be passed in instead.  See http://casperjs.org/cli.html for more details on cli arguments.