Added support for Terminal.up(), down(), left(), right() for the terminal.

src/main/java/net/rubygrapefruit/platform/PosixFile.java

@@ -4,9 +4,21 @@ import java.io.File;
 
 /**
  * Functions to query and modify a file's POSIX meta-data.
+ *
+ * Supported on Linux, OS X
  */
 public interface PosixFile extends NativeIntegration {
+    /**
+     * Sets the mode for the given file.
+     *
+     * @throws NativeException On failure.
+     */
     void setMode(File path, int perms) throws NativeException;
 
+    /**
+     * Gets the mode for the given file.
+     *
+     * @throws NativeException On failure.
+     */
     int getMode(File path) throws NativeException;
 }