Fix inert integration test

The API hit is an async call, so we need to pass it a callback
lest errors get lost.
Use my fork of mixpanel

So we can track IP address
Track IP address

Our node module adds this configuration variable.
Change variable name

Mixpanel calls it a token, let's do the same
Assign a boolean to a predicate value
Merge pull request #18 from adorableio/tracking_fixes

Tracking fixes