Latest ember
Utilize new App readiness promise to improve app initialization / reset logic
Defer App readiness immediately upon creation.

Advance App readiness as appropriate for tests vs. production.

Also, fix a mixup of initialized vs. ready in tests.
Update ember, ember-data, ember-rails & handlebars
Separate utility methods into separate file
Ember.testing can now be set outside of `beforeEach`
Cleanup comments in test_helper.js
Update screenshot to reflect new bootstrap
Add mention of @tennety's emblem.js example
Filter contacts to exclude new ones

[Fixes #41]