fix typos to Ember Data 1.0.0-beta.9 release blog

After read the "EMBER DATA V1.0.0-BETA.9 RELEASED" blog I found some typo issues and this is a fix PR.

The changes:

1. Change some non-standard double quotes.
2. Add missing highlight to JavaScript and Handlebars code.
3. Add `` to some inline code.
4. Fix `this.store.find('post', '1'])` with `this.store.find('post', '1')`.
5. Fix `buildUrl` with `buildURL`.
6. Fix the last link.