Pass event into click handler, fallback to window.event

http://stackoverflow.com/questions/17059385/referenceerror-event-is-not-defined-in-mozila-firefox
Add link to admin page from show-notice
Add Mark-as-spam functionality

* Hide spam notices
* Mark as spam from Redact Queue
* Refactor redaction spec
Route recipient and category short urls

Visiting /:recipient_name(/:categories) presents the search page with
results for the given recipient and category. Recipient is constrained
to Twitter or Google.

Examples: /Twitter/DMCA, /Google/Antitrust