Linux: Updated copyright on simulated accelrometer source

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/platforms/linux/drivers/accel/accel.cpp

 /****************************************************************************
  *
- *   Copyright (c) 2015 Mark Charlebois. All rights reserved.
+ * Copyright (c) 2014-2015 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions