Create a Caller library gem
---------------------------

                 Key: JRUBY-5506
                 URL: http://jira.codehaus.org/browse/JRUBY-5506
             Project: JRuby
          Issue Type: Improvement
          Components: JRuby-extras
            Reporter: Thomas E Enebo


Libraries are calling caller and then regexp parsing a part caller frame lines 
to get file, line, method, etc.. out.  We could make a 'require "caller"' which 
allows Caller.caller (specifics not so important) which instead of returning an 
array of strings it will return an array of Caller instances.  In JRuby, we can 
just create these directly in our impl and if we put this out as a gem then we 
can do the regexp parsing on MRI side.  Then libraries like rspec can depend on 
'caller' gem and things will work great everywhere and not be stuck with wacky 
caller regexp parsing in n-libraries.

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