Gem installs a bad shebang on application scripts (like rails)
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                 Key: JRUBY-1725
                 URL: http://jira.codehaus.org/browse/JRUBY-1725
             Project: JRuby
          Issue Type: Bug
          Components: Miscellaneous
    Affects Versions: JRuby 1.0.3
         Environment: JRuby 1.0.3, Mac OS X 10.5.1, Java 1.5
            Reporter: Caleb Land
         Attachments: fix_gem_shebang.patch

When I install rails with:

{{gem install -y rails}}

the installed rails script in my jruby bin directory has the shebang:

{{#!/Users/caleb/Applications/jruby-1.0.3/bin/jruby}}

which in Mac OS X is bad since the jruby interpreter itself is a script.

Previous versions, used:

{{#!/usr/bin/env jruby}}

which works correctly.

I've attached a patch which fixes the issue. It just comments out some lines in 
the {{lib/ruby/site_ruby/1.8/rubygems/installer.rb}} file.

Trunk still has these lines commented out.

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