Update loader.py

Adding Support for joyent locations
Update joyent.py

#535 - Added support for joyent locations
#535 - Added support for joyent locations

removed not supported for joyent.avail_locations
#535 - Added support for joyent locations

added location to get_conn method
moved get_conn call to __virtual__()

added JOYENT_LOCATIONS and get_location and avail_locations methods
#535 - Added support for joyent locations

made conn global
ensure get_conn is called in create and stop, removing need for global conn statement
Merge pull request #539 from rszabo50/develop

Support for joyent locations