Move tour markup into top-right help region

#4286

### Changes

* Make "help" region absolute position (no negative margins, cleans up style)
* Make layout tour appear in this region on every CP page
* Remove duplicate help icon on main `cp/build/layout`
* Standardize user-facing text capitalization

#### Screenshots

##### Before

![screen shot 2013-11-26 at 3 08 07 pm](https://f.cloud.github.com/assets/228733/1625892/32912eb2-56d9-11e3-9aa5-be29c0f5b448.png)

##### After

![screen shot 2013-11-26 at 3 28 55 pm](https://f.cloud.github.com/assets/228733/1625918/6bfb3670-56d9-11e3-8f44-25282b547ecf.png)