Add Windows 8.1 and Windows 2012 R2

Checking version info now has support for the later versions of windows
based on the documentation available from MSDN.
Update incognito to v2

Pulled the latest version of the incognito code from:
http://labs.mwrinfosecurity.com/blog/2012/07/18/incognito-v2-0-released/

This included a fix for Windows 2003 x64, which was reported as a bug in
RM 8281.
Merge branch 'master' into sysinfo_version
Add the getproxy command

This allows for system proxy setting to be pulled out. Windows-only at
this point.
Post V2013, Land #39, sysinfo for 8.1/2012R2

See also #46
Post V2013, Land #42, update incognito

See also #46
Post V2013, Land #43, getproxy

See also #46
Empty commit to close #46.

Closes #46. Now that these PRs are landed, no need to keep #46 open.
Discussion should continue on #34 and possibly #38.
Land #48, containing #39, #42, and #43

This lands #39, #42, and #43. #34 still needs work.