Remove direct reference and clarify

I dislike that node was called out specifically without adding proof
that it caused a disproportionate amount of growth. I also did some
wordsmithing for clarity
Add comment about Heroku and AWS
Remove hyperbole, distill thoughts
Remove run-on thoughts and hear-say. Make goal concise.
Make statements about Vagrant assertive
Refactor Salt section
Refactor Docker section
Merge pull request #1 from borgstrom/review

Review