resources: Officially add Validate method

This officially adds the Validate method to the resource API, and also
cleans up the ordering in existing resources.

resources/timer.go

@@ -60,17 +60,17 @@ func (obj *TimerRes) Default() Res {
 	return &TimerRes{}
 }
 
+// Validate the params that are passed to TimerRes.
+func (obj *TimerRes) Validate() error {
+	return nil
+}
+
 // Init runs some startup code for this resource.
 func (obj *TimerRes) Init() error {
 	obj.BaseRes.kind = "Timer"
 	return obj.BaseRes.Init() // call base init, b/c we're overrriding
 }
 
-// Validate the params that are passed to TimerRes.
-func (obj *TimerRes) Validate() error {
-	return nil
-}
-
 // newTicker creates a new ticker
 func (obj *TimerRes) newTicker() *time.Ticker {
 	return time.NewTicker(time.Duration(obj.Interval) * time.Second)