Added sitemap and paged plugins to plugin page.
Speelcheck and recap in beginner guide
Added emmet website to showcase
Merge remote-tracking branch 'upstream/master'
Added further plugin development documentation.
Added details about package.json changes for testing.
Modified package.json description a little.
Fixed heading level.
Merge pull request #3 from benjamind/master

Added plugin development documentation
Fixed sorting on plugins listing. Fixed syntax highlighting on plugin write page. Added note about versioning on plugin write page.
Updated install instructions for v6.18
Updated install instructions for v6.19
Removed QUnit site from showcase
Fixed showcase edit link
Updated install instructions for v6.20
Added the Services Plugin
Added edit link
Added Jose's website
Added rapid web development with docpad to the news section
Added nifty listing to the plugins page