Started a test for FileUtils

Created a test for the getStringFromReader method, seeing there was an issue with that specific code before.

src/test/java/com/jamierf/persistenthashmap/util/TestFileUtils.java

@@ -0,0 +1,18 @@
+package com.jamierf.persistenthashmap.util;
+
+import static org.junit.Assert.*;
+
+import java.io.IOException;
+import java.io.StringReader;
+
+import org.junit.Test;
+
+public class TestFileUtils {
+
+  @Test
+	public void testGetStringFromReader() throws IOException {
+		String string = "Testing this.";
+		assertTrue(FileUtils.getStringFromReader(new StringReader(string)).equals(string));
+	}
+
+}