Minor tweaks to Clock

src/common/clock.js

 
   get hz(){return Math.floor(1000 / this.__ticktime);}
   set hz(hz){
-    if(hz >= 1)
+    if(hz >= 1){
       this.__ticktime = 1000 / hz;
+      this.__dt = 0;
+      this.__ltime = 0;
+    }
   }
 
   clk(fn){
     if (typeof(fn) === 'function')
       this.__out.push(fn);
+    return this;
   }
 
   tick(){
         this.__out.forEach((fn)=>{fn();});
         this.__dt -= this.__ticktime
       }
+    } else {
+      // Call all of the callbacks immediately. This is the first
+      // legit tick!
+      this.__out.forEach((fn)=>{fn();});
     }
     this.__ltime = ctime;
+    return this;
   }
 }