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.
Add cookbook section
Merge branch 'master' into cookbook
WIP on inline examples on home page
Syntax highlighting for inline examples
Update for new asset structure.
More or less working with real examples
bindAttr -> bind-attr
linkTo -> link-to
Blog post about CP change
restyling tabs and adding headers
Merge pull request #646 from twokul/inline-examples

restyling tabs and adding headers
Fix enter/return consistency in the Getting Started guide.
Wrap :post_id in backticks.
Add missing backtick around Ember.Component.
Merge pull request #648 from xtian/enter-key-consistency

Fix enter/return consistency in the Getting Started guide.
Merge pull request #649 from xtian/backtick-fixes

Added missing backticks
restyling examples
Merge pull request #650 from twokul/inline-examples

restyling examples
Update CP guide: oldValue is passed to CP setter.