Drop support for Python classic classes

There were only needed to support Python < 2.2, and we now require at
least Python 2.6.

 Conflicts:
	.travis.yml
	Examples/test-suite/python/autodoc_runme.py
	Source/Modules/python.cxx

This is a cherry-pick and merge from patch in #1261

Examples/python/import_packages/same_modnames1/runme.py

@@ -10,10 +10,6 @@ print "  Finished importing pkg2.foo"
 var2 = pkg2.foo.Pkg2_Foo()
 
 classname = str(type(var2))
-# Check for an old-style class if swig was run in -classic mode
-if classname == "<type 'instance'>":
-    classname = str(var2.__class__)
-
 if classname.find("pkg2.foo.Pkg2_Foo") == -1:
     raise RuntimeError("failed type checking: " + classname)
 print "  Successfully created object pkg2.foo.Pkg2_Foo"