not all ajax should be fully serialized. allow setting. default 'GET' to not be
add new test to ensure dequeue still can keep promises
success and error options removed in favor of done and fail
really meant some in the ajax queue could be in parallel not to skip
dequeue called only when parallel request is current up in the queue
Merge pull request #524 from spine/parallelAjax

not all ajax should be fully serialized. allow setting. default 'GET' to...