[BUGFIX beta] Prevent error in failed reload().

Resolves #1511.
Fixed JSONSerializer.extractArray()
Merge pull request #1512 from rjackson/add_notFound_to_loaded_saved

[BUGFIX beta] Prevent error in failed reload().
Latest ember-dev uses local packages.

Builds are only published if all files are found, but the latest
`ember-dev` requires that `yuidocjs` be installed locally (in
`node_modules/`). Since `/docs/build/data.json` (the `yuidoc`
output file) was not found, the builds were not being published.
Merge pull request #1510 from rjackson/use_local_packages

Latest ember-dev uses local packages.
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Latest ember-dev uses local packages.
  [BUGFIX beta] Prevent error in failed reload().
Merge branch 'master' into pagination

* master:
  Latest ember-dev uses local packages.
  Fixed JSONSerializer.extractArray()
  [BUGFIX beta] Prevent error in failed reload().

Conflicts:
	packages/ember-data/lib/serializers/json_serializer.js
Added page and pageSize properties to AdapterPopulatedRecordArray