Bunch of changes to narwhal/args

[Abhinav]

Hi

I was looking at narwhal/args and found some problems and fixed them:

- The API for some of the functions isn't consistent
Issue: http://github.com/tlrobinson/narwhal/issues/issue/102
Commit: http://github.com/abhinav/narwhal/commit/2ca38c4d45dfe250c58186cd7a77f7588738a928

- Parser.reset() isn't used at all
Issue: http://github.com/tlrobinson/narwhal/issues/issue/103
Commit: http://github.com/abhinav/narwhal/commit/b39f41dd685527664259e3f2dc2a6dc8a1812fcc

- There are no tests for sub-commands
Issue: http://github.com/tlrobinson/narwhal/issues/issue/104
Commit: http://github.com/abhinav/narwhal/commit/66fbfdd2b99d366b51c878e66249c085d0b1b527

- There is almost no documentation
Issue: http://github.com/tlrobinson/narwhal/issues/issue/105
Commit: http://github.com/abhinav/narwhal/commit/6cdc22aa5c1c36bd89c6223073296ca372cb38ce

[Tom Robinson]

Also merged. Thanks!

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