DRYed up the find_bare_metal_Servers! method
added find_virtual_servers! as an analog to find_bare_metal_servers!
Added a ticket model and expanded the server models to include methods to fetch servers by ID
Refactored the 'find_xxx_servers' methods to make them 'find_servers!' on each of the server classes.  Reimplemented the servers resource of account so that it uses the refactored methods.