BLD: Makefile: add upgrade_lifestream_js, .PHONY
BLD: update jquery.lifestream.js and jquery.lifestream.min.js from https://github.com/westurner/jquery-lifestream/tree/fix_tweet_regex
BUG: pages/lifestream.html: Add white-space: pre-wrap for ul.lifestream li so that newlines wrap