Converted ShatteredPD to Build from Gradle

Major Changes:
- Shattered now builds effortlessly either from gradle CLI or android studio
- Much better dependency management through gradle (although it's not really used atm)
- Separate PD-classes repo is now SPD-classes module within main repo

SPD-classes/src/main/java/com/watabou/utils/SparseArray.java

@@ -0,0 +1,46 @@
+/*
+ * Pixel Dungeon
+ * Copyright (C) 2012-2015  Oleg Dolya
+ *
+ * Shattered Pixel Dungeon
+ * Copyright (C) 2014-2016 Evan Debenham
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package com.watabou.utils;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SparseArray<T> extends android.util.SparseArray<T> {
+
+	public int[] keyArray() {
+		int size = size();
+		int[] array = new int[size];
+		for (int i=0; i < size; i++) {
+			array[i] = keyAt( i );
+		}
+		return array;
+	}
+	
+	public List<T> values() {
+		int size = size();
+		ArrayList<T> list = new ArrayList<T>( size );
+		for (int i=0; i < size; i++) {
+			list.add( i, valueAt( i ) );
+		}
+		return list;
+	}
+}