Follow-up to #15.

- Removed the temporary directory (Options.TMP_DIR), which is no longer needed.
- Excluded original Slick2D classes that were overridden in pom.xml.
- Formatting changes and documentation.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/Options.java

@@ -42,9 +42,6 @@ import org.newdawn.slick.util.Log;
  * Handles all user options.
  */
 public class Options {
-	/** Temporary folder for file conversions, auto-deleted upon successful exit. */
-	public static final File TMP_DIR = new File(".opsu_tmp/");
-
 	/** File for logging errors. */
 	public static final File LOG_FILE = new File(".opsu.log");