Add cookbook section
Merge branch 'master' into cookbook
Organized cookbook and copied recipes from trek
added first completed recipe and updated left nav for cookbook
merged master and removed pry include
completed two recipes
Guide for incrementing and decrementing a property
Merge pull request #666 from GavinJoyce/increment-decrement

Increment and Decrement Property Guide
added setting multiple properties guide content
Merge pull request #667 from GavinJoyce/setting-multiple-properties

Setting multiple properties guide content
Add cookbook section
Organized cookbook and copied recipes from trek
added first completed recipe and updated left nav for cookbook
completed two recipes
Guide for incrementing and decrementing a property
added setting multiple properties guide content
Merge branch 'cookbook' of github.com:emberjs/website into cookbook
Removed superfluous repetition and redundancy in titles

There's a lot of this sort of thing all over the guides, and I removed
them where appropriate:

Before:

![before](http://f.cl.ly/items/2c1S1F2c36030H3U1e2A/stork.jpg)

After:

![after](http://f.cl.ly/items/0Z3w2N3f0L1k1c3r2v1d/nork.jpg)
Merge pull request #670 from machty/dry-dry-dry-dry-dry

Removed superfluous repetition and redundancy in titles
added serving_compiled_templates_using_nodejs cookbook tutorial