chore: better protractor task

[Foxandxss]

Let's use the example-config.json to contain options in how to run protractor as well.

Empty file === normal systemjs config

Then we can configure it to use the Cli:

{
  "build": "build:cli",
  "run": "http-server:cli"
}

And for webpack (this is new, I created tests for it too):

{
  "build": "build:webpack",
  "run": "http-server:cli"
}

I will take this PR to debug the webdriver issue that happens on travis.