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.
Fix broken link to Handlebars Conditionals Guide
Merge pull request #551 from Zorbash/patch-1

Fix broken link to Handlebars Conditionals Guide
typo
Merge pull request #552 from BR41N1/patch-1

Corrected a typo
Corrected a typo
Merge pull request #553 from BR41N1/patch-2

Corrected a typo
Update the-rest-adapter.md

Plurals dealing with an API need to be underscored.
Updated to 1.0.0-rc.6
update api to v1.0.0-rc.6
Draft of rc6 blogpost
Draft of rc6 blogpost
Edited RC6 blogpost
The example code block needs to use the html scanner, not the handlebars scanner, to avoid display issues
Merge pull request #558 from dgeb/home-page-example-format

Fix html/handlebars example code block on home page
provide direct links to handlebars version that work with the current
ember.
Stringifying linkTo args to prep for push for path lookups

We'll be making {{linkTo foo}} perform a lookup of the target
path on the present context for the 'foo' property, and we have
lot of references in the guides that advertise the incorrect
(albeit prettier) format of omitting the strings.
Merge pull request #559 from machty/stringify-link-to

Stringifying linkTo args to prep for push for path lookups
edited rc6 blogpost
Prose cleanup