Update creating-a-new-model.md

Defined property `newTitle` on `TodosController` with default value of empty string. Without this, line `if (!title.trim()) { return; }` will throw _Uncaught TypeError: Cannot call method 'trim' of undefined_ when trying to submit an empty string.
Update the-rest-adapter.md

Plurals dealing with an API need to be underscored.
Add cookbook section
Add some additional information about the filterProperty and invoke methods.
update checkbox binding logic error

if isAdministrator is false, then checkbox is disabled, not the other way.
added sorting to array controller guide
In routing, add description of initial routes.
Merge remote-tracking branch 'upstream/master'
added a deeply nested route example
When using imports, make sure to import console
Merge pull request #611 from cavneb/master

Added sorting to array controller guide and a deeply nested route example
Merge pull request #615 from aaronshaf/patch-1

When using imports, make sure to import console
Correct LOG_BINDINGS flag in Debug guide
Merge pull request #617 from trek/fix-log-bindings-in-debug-guide

Correct LOG_BINDINGS flag in Debug guide
Update creating-a-new-model.md

I made two small text corrections.
Merge pull request #618 from watro/patch-1

Update creating-a-new-model.md
Use plural resource name for route when talking about Rails.
Add Bustle to companies using Ember.js
Fixed headers to appear with the line underneath. Fixed header to appear on guides index page.
Merge pull request #619 from ugisozols/use_plural_resource_name

Use plural resource name for route when talking about Rails