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.

wpilibc/athena/src/Vision/HSLImage.cpp

@@ -0,0 +1,23 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2014-2016. 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 "Vision/HSLImage.h"
+
+/**
+ * Create a new image that uses the Hue, Saturation, and Luminance planes.
+ */
+HSLImage::HSLImage() : ColorImage(IMAQ_IMAGE_HSL) {}
+
+/**
+ * Create a new image by loading a file.
+ *
+ * @param fileName The path of the file to load.
+ */
+HSLImage::HSLImage(const char* fileName) : ColorImage(IMAQ_IMAGE_HSL) {
+  int success = imaqReadFile(m_imaqImage, fileName, nullptr, nullptr);
+  wpi_setImaqErrorWithContext(success, "Imaq ReadFile error");
+}