Potential for dropping csvkit dependency

[rdmurphy]

Unless there are bigger plans to use it further down the line, we could potentially pull into utils.py the code needed to power UnicodeCSVReader. It's ~40 lines and only carries the csv dependency.

https://github.com/onyxfish/csvkit/blob/master/csvkit/unicsv.py#L16

It's essentially a light rewrite of the example code provided in the csv module documentation, which they acknowledge here.

Just a thought. Could maybe make Python 3 happy as well?