Update lib\Nova.pm with new subroutines

Added functions to get Flavors, Images, Networks, and keep at least 5
instances created.

Daemon will not only ensure that at least 1 instance is active at all
times, but a minimum of 5 instances will be created at all times also.

BUG:
Created instances through daemon do not have proper networking
configured, so will most likely have an ERROR status. Will need to be
configured by hand through interface.