R1:2728a41fa06f

Make phabot understand Txxx.

Summary:
Maniphest tasks can now be summarized by referencing their respective T<id> in irc.

Test Plan:
03:29:28 <@CodeBlock> T218
03:29:29 <@codeblock-phabot> T218: NYANCAT (Priority: Wishlist) - https://secure.phabricator.com/T218
03:30:14 <@CodeBlock> T58 asdf foo bar baz mcFoo T163
03:30:15 <@codeblock-phabot> T58: Allow AphrontFormView to render as a <div /> instead of a form (Priority: Wishlist) - https://secure.phabricator.com/T58
03:30:15 <@codeblock-phabot> T163: arc…