Add public/private marks to the animator implementation. (#70)

* Add public/private marks to the animator implementation.

This will help organize some upcoming work on the animator's implementation.

* Reordered.

Author: jverkoey

src/MDMMotionAnimator.m

@@ -150,6 +150,17 @@ - (void)addCoreAnimationTracer:(void (^)(CALayer *, CAAnimation *))tracer {
   [_tracers addObject:[tracer copy]];
 }
 
+- (void)removeAllAnimations {
+  [_registrar removeAllAnimations];
+}
+
+- (void)stopAllAnimations {
+  [_registrar commitCurrentAnimationValuesToAllLayers];
+  [_registrar removeAllAnimations];
+}
+
+#pragma mark - Private
+
 - (CGFloat)computedTimeScaleFactor {
   CGFloat timeScaleFactor;
   id transactionTimeScaleFactor = [CATransaction mdm_timeScaleFactor];
@@ -166,13 +177,4 @@ - (CGFloat)computedTimeScaleFactor {
   return MDMSimulatorAnimationDragCoefficient() * timeScaleFactor;
 }
 
-- (void)removeAllAnimations {
-  [_registrar removeAllAnimations];
-}
-
-- (void)stopAllAnimations {
-  [_registrar commitCurrentAnimationValuesToAllLayers];
-  [_registrar removeAllAnimations];
-}
-
 @end