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.
update checkbox binding logic error

if isAdministrator is false, then checkbox is disabled, not the other way.
Added embedded models to the guide.

Someone should explain the difference between `always` and `load`
Fix EXTEND_PROTOTYPES documentation to use ENV object instead of Ember object
Merge pull request #639 from josh-taylor/fix-extend-prototypes-doc

Fix EXTEND_PROTOTYPES documentation to use ENV object instead of Ember object
Fix typo
Merge pull request #641 from ryanponce/patch-1

Fix typo
Fix HTML comments and syntax highlighting
Merge pull request #642 from ryanponce/master

Fix HTML comments and syntax highlighting
Added LOG_TRANSITIONS_INTERNAL to debugging guide.
Cleaned up Debugging page, added new currentRouteName on ApplicationController
Revert "remove the prod s3 build link for now. Will restore soon"

This reverts commit 3631f8f892b55739d7cc7fed31fc164db1c6d29b.
Adding Urbanspoon to companies using Ember
Merge pull request #626 from cptroot/patch-1

Added embedded models to the guide.
Merge pull request #579 from ringular/patch-1

update checkbox binding logic error
Merge pull request #555 from kiwiupover/patch-1

Update the-rest-adapter.md
Update for new asset structure.
bindAttr -> bind-attr
linkTo -> link-to