Merge pull request #158 from rjackson/move_adapter_template

Move adapter template into subdirectory.
Move adapter template into subdirectory.

Also, uses `copy_file` instead of `template` to avoid manually escaping
the ERB tags.
Update to Ember 1.4.0-beta.2.

Ember 1.3 does not properly normalize the looked up template/route
names. This causes loading and error states to not work under our
updated resolver (since we rely on path normalization).