Add support for AWS::Cognito::UserPoolIdentityProvider

[crburke]

Add a troposphere mapping for AWS::Cognito::UserPoolIdentityProvider.

[PatMyron]

Looks like AWS::Cognito::UserPoolIdentityProvider got added in this commit

troposphere/troposphere/cognito.py

Lines 285 to 295 in fb41b29

	class UserPoolIdentityProvider(AWSObject):
	resource_type = "AWS::Cognito::UserPoolIdentityProvider"
	props = {
	'AttributeMapping': (dict, False),
	'IdpIdentifiers': ([basestring], False),
	'ProviderDetails': (dict, False),
	'ProviderName': (basestring, True),
	'ProviderType': (basestring, True),
	'UserPoolId': (basestring, True),
	}