frontend initial commit
Initial HTTP API for Storm.
Improve HTTP status codes.
Always return application/json as content type.
Document `storm web`.
Minify nomalize.css.
Always use absolute paths.
Complete the integration of frontend with HTTP API.
Add favicon.
Whitespace normalization.
Remove /delete_all handler.
Port the `storm web` doc to Sphinx.
Fix filter.
Merge pull request #40 from f/web-cmd

Add `storm web` command.