Updated instance vars/properties in ApigeeHTTPManager.
Updated instance vars/properties in ApigeeHTTPManager.

developerdave/apigee-ios-sdk,developerdave/apigee-ios-sdk,apigee/apigee-ios-sdk,apigee/apigee-ios-sdk,developerdave/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk,developerdave/apigee-ios-sdk,developerdave/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk,apigee/apigee-ios-sdk,apigee/apigee-ios-sdk,apigee/apigee-ios-sdk,apigee/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk,developerdave/apigee-ios-sdk