Added some pubsub logic and some initial nats logic.

on colision by id and time don't do anythig.

On conflict do nothing on event instert.

Added event exists.

Added event exists.

Merge pull request #6 from atropos112/add_events

Adding (cloud) events support.

Forgot to add http client to vikunja api client.

Changes based on what petur suggested.

Remvoed starting api server spam...

Paging get project tasks and added enums for event name types.