Fix Multiverse dependency + fix invalid test in Eclipse

src/test/java/fr/xephi/authme/initialization/ConstructorInjectionTest.java

@@ -21,6 +21,7 @@ import static org.junit.Assert.assertThat;
  */
 public class ConstructorInjectionTest {
 
+    @SuppressWarnings("unchecked")
     @Test
     public void shouldReturnDependencies() {
         // given

src/test/java/fr/xephi/authme/initialization/FieldInjectionTest.java

@@ -127,7 +127,5 @@ public class FieldInjectionTest {
 
     private static class NoInjectionClass {
 
-        private BetaManager betaManager;
-
     }
 }