R1:cd829434d49d

Include storyText in feed POST data

Summary: I also changed PhabricatorApplicationTransactionFeedStory and the TokenGivenFeedStory to include only the title/first line of the feed story, which is more convenient (previously, strip_tags gave a multi-line story without even any linebreaks) and more consistent with the other story types.

Test Plan: Added a requestbin URL to feed.http-hooks, commented on a Differential, and saw storyText equal to "alpert added a comment to D2: c." in the POST data it…