Reset Ember example

- Vendors dependencies with Bower
- Resets to basics so future commits can build with the book
- Uses 2 spaces for tabs in HTML

Note on 2 space tabs:

In significantly nested elements (tables, for example) the 4-space tabs
were leading to chunks of markup that didn’t fit too well on pages of
the book.
Merge pull request #15 from jgwhite/reset-ember-example

Reset Ember example