Process all Sendgrid Events#5

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noelwelsh wants to merge 6 commits intoPurposeOpen:developfrom

fightforthefuture:feature/sendgrid_events

Commits on Feb 28, 2014

Process all Sendgrid Events
Noel Welsh
committed

Commits on Mar 3, 2014

Change SENDGRID_USER to SENDGRID_USERNAME for consistency with existing code
Noel Welsh
committed
Distinguish between SendGrid API credentials and event handler
Noel Welsh
committed

Commits on Mar 11, 2014

Track events with New Relic custom metrics
Noel Welsh
committed
Correct event format
Noel Welsh
committed

Commits on Mar 28, 2014

Fix typo in string interpolation
Noel Welsh
committed