Add flush interval option. Deprecate maxQueueSize for queueSize.
Countly Tests
Localytics Tests
Pull common logic into IntegrationExam
No factory for Localytics
Update DeviceID and ReferrerID to match spec.
Revert "Add flush interval option. Deprecate maxQueueSize for queueSize."

This reverts commit 95e63a90b974e408a0d752401bb1507250e25007.
Merge pull request #92 from segmentio/f2prateek/prep-2.1.10

Prep 2.1.10