Create doc for upgrading from 0.6.x to 0.7.0
Update to use site.baseurl
Word Fixes per @ssk2 review.

Update Gemfile and README.md to more accurately reflect what is need to run the docs site.
Merge pull request #498 from BenWhitehead/0.7.0-upgrade-docs

Create doc for upgrading from 0.6.x to 0.7.0