Added next_server option to subnet
Added next_server and filename for host 

to use with thin clients that boot off network
updated template file to use with host file

updated template file to use with host file for thin client host that boot off the network
Added next_server option to subnet
Add filename parameter to subnet
added comma
fixed next server issues on template files
Fixed issue with filename on next-server
Merge pull request #1 from nastechnology/master

Updated host and subnet