Recognize JRuby loaded from a classloader, not just any JAR

Such is the case if you embed JRuby into an application dynamically (such
as via OSGi). From my test environment:

```
irb(main):006:0> $LOADED_FEATURES.grep(/cli.rb/)
=> ["uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/bundler/cli.rb"]
```

Author: ccutrer

bundler/lib/bundler/cli.rb

@@ -130,7 +130,7 @@ def help(cli = nil)
 
       if man_pages.include?(command)
         man_page = man_pages[command]
-        if Bundler.which("man") && !man_path.match?(%r{^file:/.+!/META-INF/jruby.home/.+})
+        if Bundler.which("man") && !man_path.match?(%r{^(?:file:/.+!|uri:classloader:)/META-INF/jruby.home/.+})
           Kernel.exec("man", man_page)
         else
           puts File.read("#{man_path}/#{File.basename(man_page)}.ronn")