Merge pull request #528 from zachgersh/master

Fixes #527 and also updates the ruby patch version to 392
Fixed Daughter of Store Engine evaluation criteria
Update eventmanager.markdown

Corrected a typo on line 355, added the word 'to'.
Merge pull request #529 from rNavarrete/patch-1

Update eventmanager.markdown
Sketching more notes for the Heroku event
Merge branch 'master' of github.com:JumpstartLab/curriculum
Adding code samples
Minor revision of setup instructions
Sponsors
Chat URL
Livestream link
More join.me notes
Add link to discussion about indices
Update instructions for running performance suite (Heroku event)
Fix typo in query tutorial
Heroku performance timing numbers