Update RubyGems dependency to v1.7.2.
Update RubyGems dependency to v1.7.2.

oneclick/rubyinstaller,zorosteven/rubyinstaller,vemmaverve/rubyinstaller,zorosteven/rubyinstaller,vemmaverve/rubyinstaller,vemmaverve/rubyinstaller,dreamauya/rubyinstaller,jaym/rubyinstaller,suvarnaraju/rubyinstaller,auyaauya/rubyinstaller,leonhooijer/rubyinstaller,oneclick/rubyinstaller,leonhooijer/rubyinstaller,modulexcite/rubyinstaller,haonaturel/rubyinstaller,haonaturel/rubyinstaller,shirosaki/rubyinstaller,shirosaki/rubyinstaller,dreamauya/rubyinstaller,oneclick/rubyinstaller,shirosaki/rubyinstaller,jahanzaibbahadur/rubyinstaller,dreamauya/rubyinstaller,Rugbyman21/rubyinstaller,Rugbyman21/rubyinstaller,suvarnaraju/rubyinstaller,jaym/rubyinstaller,jaym/rubyinstaller,zorosteven/rubyinstaller,auyaauya/rubyinstaller,Rugbyman21/rubyinstaller,suvarnaraju/rubyinstaller,haonaturel/rubyinstaller,jahanzaibbahadur/rubyinstaller,jahanzaibbahadur/rubyinstaller,modulexcite/rubyinstaller,auyaauya/rubyinstaller,leonhooijer/rubyinstaller,modulexcite/rubyinstaller