Initial commit for Intercom fix

Adding support for company information in the group call. Breaking test skipped for initial commit.
Updates to intercom fix

Added group test back in, updated to expect the correct data
JSdoc style fix
Adding better callback handling
Intercom: fixed dates to be converted to unix timestamp in payload
Merge branch 'fix/intercom' of ssh://github.com/segmentio/integrations into fix/intercom
Fix for contributing page khaos info
Merge pull request #215 from segmentio/fix/docs

Fix for contributing page khaos info
intercom: adding additional fixtures

Recursively adding _at to date keys until we fix it later
Merge pull request #212 from segmentio/fix/intercom

Fix/intercom
Change terminology: apiKey to appId
Merge pull request #216 from segmentio/fix/heap

Fix/heap
Release 1.2.9
Send session id to attribution