Added standard library reference resolver test cases with equals and toString functions.

idea/testData/resolve/std/equals.kt

@@ -0,0 +1,2 @@
+val x = 5.<ref>equals(5)
+//jet/Numbers.jet:equals

idea/testData/resolve/std/toString.kt

@@ -0,0 +1,2 @@
+val x = 5.<ref>toString()
+//jet/Library.jet:toString

idea/tests/org/jetbrains/jet/plugin/references/StandardLibraryReferenceResolverTest.java

@@ -51,6 +51,14 @@ public class StandardLibraryReferenceResolverTest extends ResolveTestCase {
         doTest();
     }
 
+    public void testEquals() throws Exception {
+        doTest();
+    }
+
+    public void testToString() throws Exception {
+        doTest();
+    }
+
     public void testTimes() throws Exception {
         doTest();
     }