Narwal

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* hotfix: default Reddit._username to None

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* hotfix: /api/delete -> /api/del

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* fixed Listing.has_more()
* made util functions more robust
* moved saving of username until successful login
* moved decorators outside of Reddit class for easier testing
* added some tests

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* added Reddit.edit() and Commentable.edit()
* added Reddit.distinguish() and Commentable.distinguish()
* refactored .comments(), .remove(), and .delete() into Commentable
* refactored .hide() and .unhide() into Hideable (subclassed by Link, Message)
* refactored .report() into Reportable (subclassed by Link, Comment, Message)
* changed Comment.permalink to return relative path
* added useful __repr__ for Reddit
* removed debugging print statement from Reddit.comment
* changed urljoin and relative_url to return unicode strings