PY-19461 Fixed: Inspection does not recognize all subclasses

PY-19530 Fixed: from MODULE import SUBMODULE as NAME not find inheritance

If superclass is imported via 'as', save its imported and original names in stubs.
Use original name in PySuperClassIndex building and imported name in superclasses calculating

python/psi-api/src/com/jetbrains/python/psi/stubs/PyClassStub.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2016 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,9 +25,13 @@ import com.jetbrains.python.psi.PyClass;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
+import java.util.Map;
 
 public interface PyClassStub extends NamedStub<PyClass> {
-  QualifiedName[] getSuperClasses();
+  /**
+  * @return a {@code Map} which contains imported class names as keys and their original names as values
+  */
+  Map<QualifiedName, QualifiedName> getSuperClasses();
   @Nullable QualifiedName getMetaClass();
   List<String> getSlots();
   String getDocString();