Update lastAccessTime when calling getAcceleration() so we don't timeout.

framework/src/com/phonegap/AccelListener.java

@@ -118,6 +118,7 @@ public class AccelListener implements SensorEventListener, Plugin{
 						return new PluginResult(PluginResult.Status.IO_EXCEPTION, AccelListener.ERROR_FAILED_TO_START);						
 					}
 				}
+	            this.lastAccessTime = System.currentTimeMillis();
 				JSONObject r = new JSONObject();
 				r.put("x", this.x);
 				r.put("y", this.y);