Adaptable history walker of SWF queue to find last completed execution.
SWFmeta history tests, basic.
Merge pull request #65 from elifesciences/swfmeta

Swfmeta - Fixes #64. Fixes #33.
Tweak 5 minute cron time period to account for time clock differences.
Merge pull request #66 from elifesciences/tweaks

Tweak 5 minute cron time period to account for time clock differences.
Merge branch 'master' of github.com:elifesciences/elife-bot into author-email