Remove msfgui and armitage

This removes the Armitage and MSFGui components from the Metasploit
distribution. You can track the latest stable releases of these
alternate GUIs here:

MSFGui: http://www.scriptjunkie.us/msfgui/
Armitage: http://www.fastandeasyhacking.com/download
Drop msfgui.jar, too.
Update references for the las Java exploit
Landing #1753 - Updates references for java_jre17_reflection_types
Landing #1752 - Removes msfgui and armitage

[Closes #1752] - Stable releases can be tracked here:
MSFGui: http://www.scriptjunkie.us/msfgui/
Armitage: http://www.fastandeasyhacking.com/download
Fix typo
Improved docs and partial specs for Rex::Text

Conflicts:
	lib/msf/core/modules/loader/base.rb
	lib/rex/poly/block.rb
	lib/rex/text.rb