Add support for adding Servlet Context Listeners

[rsov]

Hello,

I'm using Warbler 2.0.4, with the warbler.rb config file. Wanted to add a custom context listener for tomcat.
The only way I got it to work was to modify @servlet_context_listeners variable.

Would it be possible to made a cleaner api for modifying it?

My current code:

config.webxml.instance_variable_set(:@servlet_context_listeners, 
      [config.webxml.servlet_context_listener, 'org.traf.jruby.RakeServlet'])

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[kares]

config.webxml.servlet_context_listeners << 'org.traf.jruby.Servlet' should be fine in 2.0.5