added s4u_persistence.rb
Use Post::File methods and fail_with
missed one line
I'm an idiot, fix logon xpath
Updated one print_status
Fix expire tag logic and slight clean up

Was a dumbass again and didn't fully understand how Optints worked when left blank at run time. If not 0 the expire tag will be inserted now. Also made it print the xpath if used because I believe it will be of value to the user for trouble shooting.
Merge branch 's4u_persistence' of https://github.com/smilingraccoon/metasploit-framework into smilingraccoon-s4u_persistence
make msftidy happy for s4u_persistence
rename the xml template for s4u