mixpanel: uncomment test
mixpanel: fix Date instance not working with .register()
tests: fix integrations count
mixpanel tests: fix edge-case date mismatch
Merge pull request #385 from segmentio/fix/mixpanel-arrays

fixing array.length only when array of objects
Merge pull request #384 from segmentio/mixpanel/register

Mixpanel/register
fix/mixpanel-arrays