Add todoapp benchmark

bench/implementations/ember-2.6.3/README.md

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+# Ember.js TodoMVC for Benchmarking
+
+This is an update of the
+_[Ember.js TodoMVC example](https://github.com/tastejs/todomvc/tree/gh-pages/examples/emberjs)_
+with the following changes:
+
+* Upgrade to Ember 2.6.2
+* Configure router to support relative URLs
+* Remove localStorage functionality - not relevant to measuring render performance
+
+# Building
+
+1. `npm install`
+2. `npm run make`
+3. `open dist/index.html`