Survey Banner Link

Rapid7 is currently running a user survey about Metasploit users and their use cases for a couple weeks. In order to ensure Framework folks don't miss out and have a shot at both guiding MSF development priorities and winning that sweet, sweet Pineapple Mk5, our wise marketing department suggested a banner splat.

## Verification
  - [x] See the banner displays the link:

````
       =[ metasploit v4.9.0-dev [core:4.9 api:1.0] ]
+ -- --=[ 1249 exploits - 678 auxiliary - 199 post ]
+ -- --=[ 324 payloads - 32 encoders - 8 nops      ]
+ -- --=[ Answer Q's about Metasploit and win a WiFi Pineapple Mk5   ]
+ -- --=[ http://bit.ly/msfsurvey (Expires Wed Jan 22 23:59:59 2014) ]

````

  - [x] Set your local system time to some point after Jan 22.
  - [x] See that the link is not shown:

````
$ date
Fri Feb  7 14:41:21 CST 2014
[ruby-1.9.3-p484@metasploit-framework] (marketing-scumbag-banner-spam) 
todb@mazikeen:~/git/rapid7/metasploit-framework
$ ./msfconsole -L

Unable to handle kernel NULL pointer dereference at virtual address 0xd34db33f
EFLAGS: 00010046
# ....snip....

       =[ metasploit v4.9.0-dev [core:4.9 api:1.0  ]
+ -- --=[ 1249 exploits - 678 auxiliary - 199 post ]
+ -- --=[ 324 payloads - 32 encoders - 8 nops      ]

````
 - [x] Remember to reset your clock or you're going to have a bad time.