reference global logrus (#274)

* reference logrus' global logger instead of passing and storing a logger reference everywhere

* always directly use global logrus logger instead of referencing an instance

* test suites should also directly use the global logrus logger

* rename gin logging function to clarify that it's middleware

* correct comments which erroneously referenced removed logger parameter

* setting log level for tests now uses logrus' exported type instead of the string value, to guarantee error isn't possible

testrig/router.go

@@ -27,7 +27,7 @@ import (
 
 // NewTestRouter returns a Router suitable for testing
 func NewTestRouter(db db.DB) router.Router {
-	r, err := router.New(context.Background(), NewTestConfig(), db, NewTestLog())
+	r, err := router.New(context.Background(), NewTestConfig(), db)
 	if err != nil {
 		panic(err)
 	}