Bug fixing: resume and parallel creation tasks
Small improvements to multi-label extended data source
* Using 0/1 instead of using Booleans True/False in extended multi-label columns to attempt to shrink down the raw extended csv file size
* Extended data source in case of multi-label is now by default zipped to speed upload to BigML as they tend to grow large
Bug fixing: changes to adapt code and tests to zip and 0/1 multilabel format
Refactoring in one function the waiting in max_parallel resource handling
Adding optional parameter to control parallel creation wait time
Changing the wait_step for max_parallel ensembles creation