Add tests for adding followers to projects

These do not fully check the correct behavior as followers who are not
members are added
Remove followers which are not members from projects

Otherwise the import will grant people additional permissions over what
they had in the source.
Merge pull request #17 from Asana/project-followers-must-be-members

Project followers must be members
Add a story for task creation to each task, and change timestamps to only include the date, so it doesn't matter so much that we're running everything in UTC
Drop default concurrency a bit more to avoid overloading pubsub system even at higher load
Task recurrence
Merge pull request #18 from Asana/task-recurrence

Task recurrence
Merge commit 'f6e81c65c0623afaf186608c6080ec49ef4523de' into set-assignee-status

Conflicts:
	lib/asana_export_importer/models/Task.js
	test/integration.js
Remove assignee_status from expected output of a test