Add rake

Add a rake to import [ITIS CSV](https://dl.dropboxusercontent.com/u/4378314/itis-plants.csv). 

This only imports Plant names in English, and their Latin names. No description, no nothing. Just names. 
Yeah I wasn't sure about this one either. I increased it to five because
that fills in the view nicely. I'm not sure why it should be limited except
for, you know, returning 42000 crops.

On Tue, Sep 16, 2014 at 7:00 AM, Rick Carlino <notifications@github.com>
wrote:

> In app/controllers/crop_searches_controller.rb:
>
> > @@ -6,7 +6,7 @@ def search
> >      query = (params[:cropsearch] && params[:cropsearch][:q]).to_s.singularize
> >      @crops = Crop.full_text_search(query, max_results: 2)
> >      if @crops.empty?
> > -      @crops = Crop.all.desc('_id').limit(2)
> > +      @crops = Crop.all.desc('_id').limit(5)
>
> What's the deal with this limit, anyway? I noticed @warpling
> <https://github.com/warpling> touched it some time ago and I was really
> confused why the limit was set to 2. Can you explain this one @warpling
> <https://github.com/warpling> ?
>
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> <https://github.com/FarmBot/OpenFarm/pull/174/files#r17576740>.
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