Refactor

[sc0ttj]

• separates all app and site stuff
  • app stuff moved to .app/
  • site stuff still lives in root dir
• nicer CLI interface:
  • setup
  • source .site_config
  • new post
  • help
• fixes in publish and generate_sitemap.sh:
  • commit to current branch (not always gh-pages)
• fixes setup not re-generating .site_config correctly