Activate rubyinstaller.gem when hooking into rubygems.
Activate rubyinstaller.gem when hooking into rubygems.

Since we now use rubyinstaller lib files as a gem, the load path
must be extended to require "ruby_installer". This is usually
done by rubygems, but at the point in time as operating_system.rb
is loaded is rubygems only partly operational.

oneclick/rubyinstaller2,larskanis/rubyinstaller2,oneclick/rubyinstaller2,larskanis/rubyinstaller2,oneclick/rubyinstaller2,larskanis/rubyinstaller2