Update to Rackspace Guide

##### Issue Type:

Docs Pull Request

##### Ansible Version:

1.5

##### Environment:

N/A

##### Summary:

Spelling, grammar, layout changes, plus more examples and an orchestration chapter.  These are passing build with a make viewdocs, and look good to me.  This does need a second set of eyes for review, @sivel is cc'ed.

##### Steps To Reproduce:

N/A

##### Expected Results:

N/A

##### Actual Results:

N/A