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.
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
Fix enter/return consistency in the Getting Started guide.
Wrap :post_id in backticks.
Add missing backtick around Ember.Component.
restyling examples
Update CP guide: oldValue is passed to CP setter.
Fixing indentation.

The indentation mismatch caused my manually converted haml to break. Fixing for future haml/Emberjs students.
Document that nested @each does not work
RC8 blog post
Fix comment wording of observer example.
Rename RC8 post.

This post started as a specifc post RE: computed properties, but has
morphed into a general RC8 post.
Update guides for new actions hash.