Couldn't override nillable flag globally
Class-level __nullable wasn't reliable against ocasional instance update
Test of nullable default customization
add failing test for explicit instantiation. #272
don't delete temp. schema dir that failed to build.
add forgotten import.
remove bogus test.
modernize HtmlColumnTable's class unwrapper
Merge remote-tracking branch 'arskom/master'

Conflicts:
	spyne/test/model/test_primitive.py
Merge remote-tracking branch 'arskom/master'
add testcase for multiple mappers to one table. #289
minor
separated old and new TableModel tests, also dried them a little bit.
add missing assert to test_inheritance_polymorphic_with_non_nullables_in_subclasses
Merge branch 'master' into confnil
also run tests for the deprecated sqlalchemy module.
parameterize Wsdl 1.1 class in AllYourInterfaceDocuments. #274
minor
add unittest.main call to test_sqlalchemy_deprecated.py
it was a bad idea to have an optional colorama.init() on spyne import.