Sync Pivotal Stories task.

[FionaDL]

As a user, I would like to see my pivotal stories with their updated status without having to enqueue a sync job.

Why
I want to see an updated list of pivotal stories every time I load the page
So that I don't have to synchronously sync my pivotal stories

Scenario:
Given that pivotal stories are constantly being updated
When I sign back in and open my dashboard
Then I should see a list of pivotal stories with their up to date status

Notes:
There should be a regular cron job (Heroku scheduler) that runs a rake task which does this:

Find all open pivotal stories in our system database
Call the Pivotal Tracker API to find the pivotal stories updated status and list of assignees
Update our database accordingly

[etagwerker]

@FionaDL quick question about this. Do we have a scheduled job running in Heroku? If so, how often does it run?

[cleicar]

@etagwerker yes, we do. Right now we only have the jobs for Pull Requests and Issues