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/glwrap/Shader.java

@@ -0,0 +1,65 @@
+/*
+ * 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.glwrap;
+
+import android.opengl.GLES20;
+
+public class Shader {
+
+	public static final int VERTEX		= GLES20.GL_VERTEX_SHADER;
+	public static final int FRAGMENT	= GLES20.GL_FRAGMENT_SHADER;
+	
+	private int handle;
+	
+	public Shader( int type ) {
+		handle = GLES20.glCreateShader( type );
+	}
+	
+	public int handle() {
+		return handle;
+	}
+	
+	public void source( String src ) {
+		GLES20.glShaderSource( handle, src );
+	}
+	
+	public void compile() {
+		GLES20.glCompileShader( handle );
+
+		int[] status = new int[1];
+		GLES20.glGetShaderiv( handle, GLES20.GL_COMPILE_STATUS, status, 0 );
+		if (status[0] == GLES20.GL_FALSE) {
+			throw new Error( GLES20.glGetShaderInfoLog( handle ) );
+		}
+	}
+	
+	public void delete() {
+		GLES20.glDeleteShader( handle );
+	}
+	
+	public static Shader createCompiled( int type, String src ) {
+		Shader shader = new Shader( type );
+		shader.source( src );
+		shader.compile();
+		return shader;
+	}
+}