Remove Python2 buitin "print" from Python3's grammr. Start class tests

test/simple_source/def/01_class.py

@@ -0,0 +1,2 @@
+class A:
+    pass

test/simple_source/def/10_class.py

@@ -0,0 +1,33 @@
+class A:
+
+    class A1:
+        def __init__(self):
+            self.a1 = True
+
+        def foo(self):
+            self.b = True
+
+    def __init__(self):
+        self.a = True
+
+    def foo(self):
+        self.fooed = True
+
+
+class B:
+    def __init__(self):
+        self.bed = True
+
+    def bar(self):
+        self.barred = True
+
+
+class C(A,B):
+    def foobar(self):
+        self.foobared = True
+
+
+c = C()
+c.foo()
+c.bar()
+c.foobar()