Move todo to todo.md

TODO.md

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+# TODO
+* cache headers for static assets (and on document GET)
+* tests
+* fix that chrome bug where it loads the doc twice
+* expand extension map
+* kick expiration back by increment on each view
+* Add file extensions ourselves to push state
+* Proper markdown highlighting
+
+
+# shared version only
+* some way to do announcements easily (and use for ads)
+* start using CDNs for most assets (optional)
+
+
+# with brian's design
+* add feedback for errors to UI - esp. too long
+* add link to about page
+* copy URL to clipboard button