Support different browser versions if defined

[NikolayMakhonin]

WebDriver specification suggests to use the browserVersion parameter:
https://w3c.github.io/webdriver/#capabilities

{
	"browserName": "firefox",
	"browserVersion": "1234"
}

But I not see how selenium-standalone can use this option.
Is it possible to use several browsers versions in selenium-standalone, with configuration like this?:

???
selenium.install({
  ...
  drivers: {
    chromium33: { //Android 4.4 WebView
      driverPath: 'C:/drivers/chrome/2.10',
      browserPath: 'C:/browsers/chromium/33.0.1750.170'
    },
    chromium33: { //Android 5.0 WebView
      driverPath: 'C:/drivers/chrome/2.12',
      browserPath: 'C:/browsers/chromium/37.0.2062.99'
    },
    chromium44: { //Android 6.0 WebView
      driverPath: 'C:/drivers/chrome/2.20',
      browserPath: 'C:/browsers/chromium/44.0.2403.119'
    },
    ...
  },
  ...
}, cb);

[mgrybyk]

I think it's not supported, feel free to raise a PR for that!

[mgrybyk]

#491 should be done as a part of this issue