Added send_retry
Added send_retry

This function sends a snap, with only one call to the server.
mgp25/SC-API,hako/SC-API,TomKfr/SnAPI-Chat,marank/SC-API,DarrenRainey/SC-API,JamesMarino/Snapchat-API,modsfabio/SC-API,kristjanmik/Snap-API,vikingfuneral/Hart-Challenge