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 embedded models to the guide.

Someone should explain the difference between `always` and `load`
Typo in routing guide. Small css fix.
Don't use string literals in bindAttr docs
Merge pull request #636 from jgelens/master

Added Silver Egg to companies using Ember
Merge pull request #634 from samselikoff/master

Typo in routing guide. Small css fix.
Have the TodosController extend Ember.Controller instead of Ember.Object.

Apparently not truly a "bug" but maybe not the best approach.
Merge pull request #637 from nathanhammond/patch-1

Have the TodosController extend Ember.Controller instead of Ember.Object...
Merge branch 'master' into cookbook
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
WIP on inline examples on home page