add debugger support please

[sneakywombat]

Could you please add remote-debugger-port and remote-debugger-autorun?

I tried to hack this in myself,

index.js:
if (this.options.debuggerPort !== null) {
flags.push('--remote-debugger-port='+this.options.debuggerPort);
flags.push('--remote-debugger-autorun=yes');
}

But it didn't work, the console complained with the following:

phantom stdout: TypeError: 'undefined' is not a function (evaluating 'core_require('webpage')')

about:blank:5433
about:blank:5642
about:blank:179
about:blank:25
about:blank:5645
:1

[reinpk]

hmmm, seems like this may be an underlying issue with phantom:
http://stackoverflow.com/questions/13490324/running-phantomjs-node-js-together-on-ubuntu

but i'm seeing the same error with phantomjs 1.9.7.... so maybe this is an issue that just isn't being addressed until 2.0

[reinpk]

leaving similar code on a branch here until we have more info:
https://github.com/segmentio/nightmare/tree/add/debugger

[reinpk]

in 2.x we've moved from phantomjs to electron, which has fixed a bunch of weird issues. among other things, you can now pass in { show: true } as a constructor argument to just show the window as things are happening.

yield Nightmare({ show: true })
        .goto('http://walmart.com/')
        .click(...);

hopefully this helps with debugging!