Remove the deprecated phantom.args

[ariya]

The use of phantom.args has been deprecated (see commit 545a3f7) since a long time ago (version 1.5, March 2012). It is time to remove it in the upcoming major version PhantomJS 2.

Any old scripts need to switch to use System#args instead.

// old API
console.log('First argument is', phantom.args[0]);
console.log('Second argument is', phantom.args[1]);
phantom.exit();

// new API
var system = require('system');
console.log('First argument is', system.args[1]);
console.log('Second argument is', system.args[2]);
phantom.exit();