Updates to browser_autopwn to attempt exploits by rank for enhanced
reliability
	modified:   modules/auxiliary/server/browser_autopwn.rb
Small cleanup of browser_autopwn updates
	modified:   modules/auxiliary/server/browser_autopwn.rb
Fix nil ua_name processing and other minor tweaks
	modified:   modules/auxiliary/server/browser_autopwn.rb
Reverted browser variable name from testing