Added viewclassparams, getfile, and putfile actions plus determine_class.lua script and provisioning_requests table.

viewclassparams shows the parameters and default values for a class
getfile is used to get the config file for a known device and a default config file for unconfigured devices
putfile is unimplemented, but will be used for parsing files uploaded to the server
determine_class.lua determines which device class best matches an unconfigured device (by agent)
provisioning_requests table will track the last request (ip, agent, and timestamp) for each device