Enhance Documentation - Include Test Suites

[chris-stage]

Hey!

I am trying to use grunt-webdriver to run test suites in sequence instead of running all spec files at once. Here is my conf.js file:

`exports.config = {
//
// ====================
// Runner Configuration
// ====================
//
// WebdriverIO allows it to run your tests in arbitrary locations (e.g. locally or
// on a remote machine).
runner: 'local',

//
// ==================
// Specify Test Files
// ==================
// Define which test specs should run. The pattern is relative to the directory
// from which `wdio` was called. Notice that, if you are calling `wdio` from an
// NPM script (see https://docs.npmjs.com/cli/run-script) then the current working
// directory is where your package.json resides, so `wdio` will be called from there.
//
specs: [
    './test/specs/login/**/*.js'
],
suites: {
    login_ui: [
        './test/specs/login/reporter_login_ui.spec.js',
        './test/specs/login/reporter_login_errors.spec.js'
    ],
    login: [
        './test/specs/login/reporter_login.spec.js',
        './test/specs/login/reporter_logout.spec.js'
    ],
    login_timeout: [
        './test/specs/login/reporter_login_timeout.spec.js',
        './test/specs/login/reporter_login_retry.spec.js'
    ],
    login_reject: [
        './test/specs/login/reporter_login_reject.spec.js'
    ]
},`

I am trying to solve the problem of having using the command line to execute suites in order:
./node_modules/.bin/wdio wdio.login.conf.js --suite login_ui
./node_modules/.bin/wdio wdio.login.conf.js --suite login
./node_modules/.bin/wdio wdio.login.conf.js --suite login_timeout

Any help would be much appreciated.

Thanks,
Chris