Grand test fixup (#138)

* start fixing up tests

* fix up tests + automate with drone

* fiddle with linting

* messing about with drone.yml

* some more fiddling

* hmmm

* add cache

* add vendor directory

* verbose

* ci updates

* update some little things

* update sig

vendor/github.com/go-fed/activity/pub/clock.go

@@ -0,0 +1,11 @@
+package pub
+
+import (
+	"time"
+)
+
+// Clock determines the time.
+type Clock interface {
+	// Now returns the current time.
+	Now() time.Time
+}