SSG-100: updated readme file
Revert "SSG-100: removed vistigial files and updated gitignore"

This reverts commit 6daa3d2bad31ac9d6f59210553b00a875397e8c0.
SSG-100: added _content to gitignore
SSG-100: updated _config to disable autogeneration
SSG-100: updated gem and proc files for heroku deployment
SSG-100: readded gemfile.lock