in the xml serialzing code, make variables more descriptive. add headers dictionary to AbstractRequest. Make verbose flag in xml serializing code default to False. Clean up Credentials.is_valid() code
in the xml serialzing code, make variables more descriptive. add headers dictionary to AbstractRequest. Make verbose flag in xml serializing code default to False. Clean up Credentials.is_valid() code

SpectraLogic/ds3_python_sdk,chanchett/ds3_python_sdk,chanchett/ds3_python_sdk,chanchett/ds3_python_sdk,chanchett/ds3_python_sdk_,SpectraLogic/ds3_python_sdk,SpectraLogic/ds3_python_sdk