Add the Ability to Read Issue Comments

[sorin-ionescu]

I would like to be able to read issue comments.

[stephencelis]

Works for me:

% ghi 32
      number:  32
       state:  closed
       title:  test               
        user:  stephencelis
       votes:  0
  created at:  2012-01-08 18:12:10 -0800
  updated at:  2012-01-08 18:25:22 -0800

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stephencelis commented:

    comment

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