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 for new asset structure.
bindAttr -> bind-attr
linkTo -> link-to
Blog post about CP change
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
Update CP guide: oldValue is passed to CP setter.
Merge pull request #651 from rjackson/add_computed_property_old_value_to_guide

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.
Merge pull request #652 from spundun/patch-1

Fixing indentation.
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.
Merge pull request #654 from rjackson/adjust_wording_of_blog_post_example

Rename RC8 blog post & Fix comment wording.
Update guides for new actions hash.