Fixing image asset paths for recently imported blog posts

- Fixes 598
First commit to use nginx static gzip codepaths
Disable diyChunking in Jenkins.
Use the publisher certificate to auth jenkins-cli.

As drg-user.
Merge pull request #611 from rackerlabs/gh-598

Fixing image asset paths for recently imported blog posts
Fix `<!-- more -->` tags so they aren't escaped and rendered.
Removing unused highlighting
Fixing busted asset path in blog post
Adding DevBlog contributing guidelines
Merge pull request #629 from byronmccollum/dev

Fix `<!-- more -->` tags so they aren't escaped and rendered.
Merge pull request #632 from rackerlabs/dev

Pushing to production after reviewing on staging
Adding review/moderation guidelines.
Adding --delete to build site rsync
Moving gzip_static to server block
Adding log messages.
Merge pull request #617 from rackerlabs/nginx-static-gzip

Pre-gzip html files for sending via nginx
developer plus signup page added
dev+ support site complete
copy changes - adding tm and lowercase

went through and made sure we had "developer+&trade;" everywhere and
all instances were lowercase d
signup buttons added

Replaced broken signup form with buttons for US and UK customers. Not
sure what else needs to be here, but it needs work.