Install emacs and vim.
Refactoring deployment region variable into vars.yml.
Add deployment region to infrastructure names.
Generate blog categories under /blog/categories (instead of default /categories).
Rewrite /categories URLs to /blog/categories URLs.
Merge pull request #843 from ycombinator/install-editors

Install emacs and vim.
Merge pull request #844 from ycombinator/better-named-infra

Better named infra
Merge pull request #845 from ycombinator/fix-blog-categories-path

Fix blog categories path