Added SystemInfo and FileSystems to query system and file system information, respectively.

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

@@ -0,0 +1,12 @@
+package net.rubygrapefruit.platform;
+
+import java.util.List;
+
+public interface FileSystems extends NativeIntegration {
+    /**
+     * Returns the set of all file systems for the current machine.
+     *
+     * @throws NativeException On failure.
+     */
+    List<FileSystem> getFileSystems() throws NativeException;
+}