add yesterday functionality

[gfr10598]

This completes the implementation of processing of yesterday's data at 0600 UTC.

---

This change is 

[coveralls]

Coverage increased (+0.5%) to 62.772% when pulling fe12338 on handle-yesterday into 3e6ec5a on master.

[stephen-soltesz]

one suggestion.

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @gfr10598 and @stephen-soltesz)

---

job-service/job-service.go, line 86 at r1 (raw file):

	// Recover the date from datastore.
	ctx, cf := context.WithTimeout(context.Background(), 5*time.Second)

nit: I'd recommend passing in the context. It looks like NewJobService is already allocating one context for another function. Putting the call there will make it easier to provide a context from main (or whatever is one level up).

Right now we have a bunch of random background contexts for functions doing complex things at lower levels.

[gfr10598]

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @stephen-soltesz)

---

job-service/job-service.go, line 86 at r1 (raw file):

Previously, stephen-soltesz (Stephen Soltesz) wrote…

nit: I'd recommend passing in the context. It looks like NewJobService is already allocating one context for another function. Putting the call there will make it easier to provide a context from main (or whatever is one level up).

Right now we have a bunch of random background contexts for functions doing complex things at lower levels.

Added ctx injection here and in other places.