Fixed timestamp name mismatch.

lib/scatter.js

@@ -138,10 +138,8 @@ class Throwable {
         this.autoThrow = autoThrow
         this.velocities = []
         this.velocity = null
-        this.timestamp = null
+        this.lastframe = null
         this.onThrowFinished = onThrowFinished
-        this._requestAnimation = 0
-        //console.log("onThrowFinished", onThrowFinished)
     }
 
     static defaultThrow() {
@@ -182,6 +180,7 @@ class Throwable {
 
     addTestVelocity(delta, dt=20, buffer = 5) {
         let t = performance.now()
+        this.lastframe = t
         let velocity = {
             t: t,
             dt: dt,
@@ -216,6 +215,7 @@ class Throwable {
     killAnimation() {
         this.velocity = null
         this.velocities = []
+        this.lastframe = null
     }
 
     startThrow() {