[DRAFT] Add a CSV resource importer for creating and updating solr documents with data from a spreadsheet

Nowhere close to ready, but a little experiment: 

![screen shot 2014-02-28 at 16 45 08](https://f.cloud.github.com/assets/111218/2299969/d425a212-a0da-11e3-9f5d-8bf32211e2b3.png)
![screen shot 2014-02-28 at 16 45 05](https://f.cloud.github.com/assets/111218/2299970/d43b1da4-a0da-11e3-9d64-2ea2d19c0119.png)
![screen shot 2014-02-28 at 16 45 21](https://f.cloud.github.com/assets/111218/2299971/d4435be0-a0da-11e3-94e5-ff7ea5282248.png)