modified do_GET fxn to pass in httr config options as config param instead of ellipses
updated interface to droplets fxn with new params
updated droplets_new fxn for new interface, e.g. using POST instead of GET now, new fxn do_POST to go along
changed ... param to config to pass in httr options, still need to change in fxn param definition
replaced ... with  config param to regions, actions, images, sizes fxns
replaced ... with config for all droplets extension fxns
moved delete and post handlders to zzz file and added man pages for them
also, not exporting man files for request handlers anymore, though making the man pages for internal use