added a callback arguments param to xhr, changed send statement to return the id to the caller, either through the callback or function return
added a callback arguments param to xhr, changed send statement to return the id to the caller, either through the callback or function return

ELSUru/xAPIWrapper,adlnet/xAPIWrapper,creighton/xAPIWrapper,creighton/xAPIWrapper,ljwolford/xAPIWrapper,adlnet/xAPIWrapper,ljwolford/xAPIWrapper,ELSUru/xAPIWrapper