Declare leading-commas to be consistent in style.

[cstumph]

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[cstumph]

We currently have 2 indentation inconsistencies:

• indenting the leading comma VS not indenting
• consecutive vars VS obj properties.

This addresses the first inconsistency. It was requested I address the second as part of this pull request.
I've not had an issue with the second inconsistency, nor have I noticed others having an issue with it, so I can't say I'm comfortable making additional impositions on the issue.
Personally I'm okay with a difference existing between two functionally different pieces of syntax.
My main axe to grind here is ease of readability regarding object composition, preferably not at the cost of consecutive var statement readability IMO.

Furthermore, there's stuff like when people drop to a new line doing long chained function calls, etc. We can say "don't do that" but it can and will happen sometimes. So biting off more here, I think, has potential to go even further...

[cstumph]

Btw, example of this in our codebase. Doesn't seem to cause issue. Seemingly no struggles because of it:

var Base = require('ribcage-view')
  , _ = require('lodash')
  , Button = require('../../pieces/button')
  , ProfileEdit = require('../profile-edit')
  , SettingsContractorStep = require('./step')
  , currentUser = require('../../../app/current-user.js')
  , dataTypeBackboneModel = require('../../mixins/dataType-backbone-model')
  , State = require('ampersand-state').extend({
      extraProperties: 'reject'
    , toJSON: function toJSON(){
        return _.extend(this.serialize(), this.getAttributes({derived: true}))
      }
    }).extend(dataTypeBackboneModel())