Tweaks to the call for conference abstracts.
Reproduciblility -> Reproducible
Merge pull request #8 from thewtex/conference_call_tweaks

Tweaks to the call for conference abstracts.
added mailing lists spammed
Call for Abstracts -> Call for Submissions

Suggested-by: Anthony Scopatz <anthony.scopatz@gmail.com>
Add Jonathan's announcement suggestions for the papers.
Change call deadline to the 20th.