arussellsaw/mutex locked maps

## mutex locked maps
type mutexMap struct {
  someMap map[string]int
  lock sync.Mutex
}

func main() {
  mutexMap.lock.Lock()
  defer mutexMap.lock.Unlock()
  mutexMap.someMap["herp"] = "derp"
}
	type mutexMap struct {
	someMap map[string]int
	lock sync.Mutex
	}

	func main() {
	mutexMap.lock.Lock()
	defer mutexMap.lock.Unlock()
	mutexMap.someMap["herp"] = "derp"
	}