IE doesn't load javascript files unless the mimetype is right

timezone.js should be sent as a javascript file instead of html
Fix up trailing commas in the javascript

Olrder versions of IE are unhappy if you have trailing commas
in your javascript.  Fixes #282 and #277
Include excanvas so that IE will work for streaming view

flot needs excanvas on IE.  Fixes #283
Make streaming work on IE

IE caches the empty page loads of /stream/hash/ts and won't refetch
them. So add a cache busting query string so that it will keep refetching
and make the streaming view actually work on IE
Merge pull request #328 from katzj/ie-fixes

Fix up a set of IE issues