pydisassemble improvements; DRY scannners

disas.py:
 - disassembles *all* code objects found

scanner*.py:
 - no longer need to pass in version numbers; this
   is obtained from the class name
 - no longer pass in opcodes; this is done at
   initialization from the scanner name
 - all Pythoin 3 scanners support native disassembly

uncompyle6/scanners/scanner34.py

@@ -2,29 +2,38 @@
 """
 Python 3.4 bytecode scanner/deparser
 
-This sets up opcodes Python's 3.5 and calls a generalized
+This sets up opcodes Python's 3.4 and calls a generalized
 scanner routine for Python 3.
 """
 
 from __future__ import print_function
 
-from uncompyle6.scanners.scanner3 import Scanner3
-from uncompyle6.opcodes.opcode_34 import opname as opnames
+import uncompyle6
 
 # bytecode verification, verify(), uses JUMP_OPs from here
 from uncompyle6.opcodes.opcode_34 import JUMP_OPs
 
+from uncompyle6.scanners.scanner3 import Scanner3
 class Scanner34(Scanner3):
+
+    def __init__(self):
+        super(Scanner3, self).__init__(3.4)
+
     def disassemble(self, co, classname=None, code_objects={}):
-        return self.disassemble3(co, opnames, classname, code_objects)
+        return self.disassemble3(co, classname, code_objects)
 
     def disassemble_native(self, co, classname=None, code_objects={}):
-        return self.disassemble3_native(co, opnames, classname, code_objects)
+        return self.disassemble3_native(co, classname, code_objects)
 
 if __name__ == "__main__":
-    import inspect
-    co = inspect.currentframe().f_code
-    tokens, customize = Scanner34(3.4).disassemble(co)
-    for t in tokens:
-        print(t)
-    pass
+    from uncompyle6 import PYTHON_VERSION
+    if PYTHON_VERSION >= 3.2:
+        import inspect
+        co = inspect.currentframe().f_code
+        tokens, customize = Scanner34(3.4).disassemble(co)
+        for t in tokens:
+            print(t)
+        pass
+    else:
+        print("Need to be Python 3.2 or greater to demo; I am %s." %
+              PYTHON_VERSION)