Renamed folders for consistency, using sim/athena/shared schema (#27)

Rename the following folders:
hal/lib/Athena -> hal/lib/athena
hal/lib/Desktop -> hal/lib/sim
hal/lib/Shared -> hal/lib/shared
wpilibc/Athena -> wpilibc/athena
wpilibc/simulation -> wpilibc/sim

Windows users may need to run gradlew clean after updating.

hal/lib/athena/Utilities.cpp

@@ -0,0 +1,52 @@
+/*----------------------------------------------------------------------------*/
+/* 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/Utilities.hpp"
+#include <time.h>
+
+const int32_t HAL_NO_WAIT = 0;
+const int32_t HAL_WAIT_FOREVER = -1;
+
+extern "C" {
+
+void delayTicks(int32_t ticks) {
+  struct timespec test, remaining;
+  test.tv_sec = 0;
+  test.tv_nsec = ticks * 3;
+
+  /* Sleep until the requested number of ticks has passed, with additional
+          time added if nanosleep is interrupted. */
+  while (nanosleep(&test, &remaining) == -1) {
+    test = remaining;
+  }
+}
+
+void delayMillis(double ms) {
+  struct timespec test, remaining;
+  test.tv_sec = ms / 1000;
+  test.tv_nsec = 1000 * (((uint64_t)ms) % 1000000);
+
+  /* Sleep until the requested number of milliseconds has passed, with
+          additional time added if nanosleep is interrupted. */
+  while (nanosleep(&test, &remaining) == -1) {
+    test = remaining;
+  }
+}
+
+void delaySeconds(double s) {
+  struct timespec test, remaining;
+  test.tv_sec = (int)s;
+  test.tv_nsec = (s - (int)s) * 1000000000.0;
+
+  /* Sleep until the requested number of seconds has passed, with additional
+          time added if nanosleep is interrupted. */
+  while (nanosleep(&test, &remaining) == -1) {
+    test = remaining;
+  }
+}
+
+}  // extern "C"