Use ParaText for parsing CSV files fast

[v0dro]

We can shift to using paratext for parsing CSV files very fast: https://github.com/wiseio/paratext

It claims to parse CSV's at 2.5 GB per second, which is huge. Of course the actual wrapper will need to rest in a separate gem. Daru from_csv can use the paratext wrapper if it is available.

https://github.com/wiseio/paratext/issues/27 http://www.wise.io/tech/paratext

[rainchen]

+1