artf2612: Update license in source files.

Years update, references to WIND_BASE were removed, and WPILib license was
moved to the root directory of the project.

If there was already a comment block, a year range through 2016 was created
using the first year in the comment. If there was no comment block, a block
with just the year 2016 was added.

Comments were not added to files from external sources (NI, CTRE).

Change-Id: Iff4f098ab908b90b8d929902dea903de2f596acc

hal/lib/Athena/cpp/priority_mutex.cpp

@@ -1,3 +1,10 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2016. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
 #include "HAL/cpp/priority_mutex.h"
 
 void priority_recursive_mutex::lock() {