DOC: more typos
BUG: limit context injection to specific methods, cleanup
CLN: use tornado's prepare, rather then __init__
ENH: warn user with 500 message when template path doesn't exist
CLN: propegate changes to other examples
TST: add test for passsing kwds to handler vir @http_handler

use tornado's 'initialize' hook
BUG: python 2.6 doesn't support zero length field in format

"{}".format(i) yields an error