Ember Infinity Versions Save

@cgwic updated an error message and moved ember-cli-version-checker into dependencies.

This release just adds @truenorth's work for Github Pages, and adds the demoURL property to the package.json for Ember Observer & Ember Addons.

@truenorth built out the ability to modify the default query params sent to the server, and the default place ember-infinity looks for the total pages count in the payload. He also did a major refactor to bring the codebase up to snuff with ES6!

This version just moves ember-cli-version-checker to dependencies. Apparently this was causing some problems for folks, see #16

@Keeo Updated the readme & added the modelPath attribute, for models that are set differently to controller.model. @amedrz Added the ember CLI version checker, to ensure the user has Ember CLI 0.2.0 or higher.

@bruce refactored infinity-route to allow additional parameters to be passed into the infinityModel call. via #9

• @greis added scrollable attr, allowing the developer to specify a jQuery selector used to find the element to bind scroll to. If it's not specified (or is not a string) the scrollable element will default to the window.

Rename infinite-loader attribute from infiniteModel to infinityModel to maintain consistency across the addon.

ember install:addon ember-infinity