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
update checkbox binding logic error

if isAdministrator is false, then checkbox is disabled, not the other way.
%s/App.Post.all()/App.Post.find()/g

In ember it's Model.find() not Model.all()
Component Handling User Interaction guide
Fixed broken link
Merge pull request #602 from rutinerad/patch-1

Fixed broken link
Merge pull request #598 from clyfe/patch-1

%s/App.Post.all()/App.Post.find()/g
added sorting to array controller guide
Revert to rc3 to GSG
Merge pull request #606 from trek/revert-to-rc3

Revert to using RC3 until known matching data SHA
Remove reference to `template` helper.

Seems unnecessary. Plus, if you use `template`, you'll get
an Ember.warn
update home page to be clear ember is 56kb minified + gziped
Merge pull request #607 from machty/deprecate-template

Remove reference to `template` helper.
[fixes #608] fix some typos.

thanks @shellyan for pointing them out.
In routing, add description of initial routes.
Merge remote-tracking branch 'upstream/master'
added a deeply nested route example
Update redirection.md

transitionTo is deprecated, updating to transitionToRoute for Ember 1.0.0-rc.6.1