Ember version updated from 1.10 to 2.10

[yarigpopov]

I updated version of Ember. Now it uses Ember v2.10 with Glimmer2 engine, which was released 2 days ago.

I put ENV.js into internal lib folder since I had to fix the line 155 with

if (data.hasOwnProperty(i)) {...}

File vendor.js contains minified and uglified versions of jQuery 3.1.1, Ember and Ember-data due to building process of Ember CLI tool.

See this repo for the source code:
https://github.com/chilicoder/js-repaint-perfs-ember

Closes #57

[yarigpopov]

@mathieuancelin please, review