Small cleanups / changes amassed over time

- Small javadoc fixes
- Simplifications
- Move logException method from StringUtils to ExceptionUtils

src/test/java/fr/xephi/authme/util/ExceptionUtilsTest.java

@@ -4,8 +4,10 @@ import fr.xephi.authme.ReflectionTestUtils;
 import fr.xephi.authme.TestHelper;
 import org.junit.Test;
 
+import java.net.MalformedURLException;
 import java.util.ConcurrentModificationException;
 
+import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.nullValue;
 import static org.hamcrest.Matchers.sameInstance;
 import static org.junit.Assert.assertThat;
@@ -58,4 +60,16 @@ public class ExceptionUtilsTest {
         // given / when / then
         TestHelper.validateHasOnlyPrivateEmptyConstructor(ExceptionUtils.class);
     }
+
+    @Test
+    public void shouldFormatException() {
+        // given
+        MalformedURLException ex = new MalformedURLException("Unrecognized URL format");
+
+        // when
+        String result = ExceptionUtils.formatException(ex);
+
+        // then
+        assertThat(result, equalTo("[MalformedURLException]: Unrecognized URL format"));
+    }
 }

src/test/java/fr/xephi/authme/util/StringUtilsTest.java

@@ -3,8 +3,6 @@ package fr.xephi.authme.util;
 import fr.xephi.authme.TestHelper;
 import org.junit.Test;
 
-import java.net.MalformedURLException;
-
 import static java.util.Arrays.asList;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.greaterThan;
@@ -63,18 +61,6 @@ public class StringUtilsTest {
         assertFalse(StringUtils.isEmpty(" test"));
     }
 
-    @Test
-    public void shouldFormatException() {
-        // given
-        MalformedURLException ex = new MalformedURLException("Unrecognized URL format");
-
-        // when
-        String result = StringUtils.formatException(ex);
-
-        // then
-        assertThat(result, equalTo("[MalformedURLException]: Unrecognized URL format"));
-    }
-
     @Test
     public void shouldGetDifferenceWithNullString() {
         // given/when/then