Added instructions for adding a new language/SDK to the site.
Updating references to performance flavors in full code examples.
Updating references to performance flavors in Ansible playbooks.
Merge pull request #925 from ycombinator/replace-perf-flavor

Replace performance flavors
Improvement needed for instructions related to adding a language and/or SDK to the site.
More small typo fixes.
Merge pull request #907 from DonSchenck/add-new-language

Added instructions for adding a new language/SDK to the site.
Pin the Ruby version to a known good state.
Merge pull request #927 from smashwilson/pin-ruby-version

Pin the Ruby version to a known good state.
Merge pull request #930 from rackerlabs/dev

Syncing master from dev