Fix some navigation bugs (thanks jrbudda)

.gitignore

@@ -2,4 +2,5 @@
 /target
 .classpath
 .project
-Citizens.jar
+Citizens.jar
+*.lnk

src/main/java/net/citizensnpcs/npc/ai/CitizensNavigator.java

@@ -140,6 +140,10 @@ public class CitizensNavigator implements Navigator {
         executing = null;
         localParams = defaultParams;
         stationaryTicks = 0;
+        if (npc.isSpawned()) {
+            EntityLiving entity = npc.getHandle();
+            entity.motX = entity.motY = entity.motZ = 0F;
+        }
     }
 
     private void stopNavigating(CancelReason reason) {

src/main/java/net/citizensnpcs/npc/entity/EntityHumanNPC.java

@@ -116,7 +116,10 @@ public class EntityHumanNPC extends EntityPlayer implements NPCHolder {
             navigation.e();
             moveOnCurrentHeading();
         } else if (!npc.getNavigator().isNavigating() && (motX != 0 || motZ != 0 || motY != 0)) {
-            e(0, 0);// is this necessary? it does gravity/controllable but
+            if (Math.abs(motX) < EPSILON && Math.abs(motY) < EPSILON && Math.abs(motZ) < EPSILON) {
+                motX = motY = motZ = 0;
+            } else
+                e(0, 0); // is this necessary? it does gravity/controllable but
             // sometimes players sink into the ground
         }
         if (noDamageTicks > 0)
@@ -180,5 +183,7 @@ public class EntityHumanNPC extends EntityPlayer implements NPCHolder {
         as = yaw; // update head yaw to match entity yaw
     }
 
+    private static final float EPSILON = 0.001F;
+
     private static final float STEP_HEIGHT = 1F;
 }