Change error message to a more descriptive message (include name of the
    culprit parameter)

    Old message: `Type of None should be in (<type 'str'>, <type
'unicode'>)`

    New message: `q's value: None should be in types (<type 'str'>, <type
    'unicode'>)`
Merge branch 'master' into AddMoreDescriptiveErrorMessage

Conflicts:
	swaggerpy/client.py
	swaggerpy/swagger_type.py
Merge branch 'AddMoreDescriptiveErrorMessage'