moved backend and server logic from instance to their own classes
refactored instance to work with backend and server objects
added myself as another author
version bump
added error checking for invalid server id entries
-- updated the status command to only work with a single backend
-- added several new methods to backend class to find all the servers with a paticular status easily
added ability to determine if socket is available
updated readme
added haproxy-manager binary to control via command line