fixed typos in NDVI browser #19
Crop data complete example.

Add a new exercise on the crop_agro page that:

1. Add a new crop
2. Add new styles on GS (styles attached)
3. Add new data with a CSV ingestion (CSV file attached)
4. View the new data on the portal
5. Clean the data
Merge branch 'issue_17_add_crop_sld' of git://github.com/alediator/crop-information-portal into alediator-issue_17_add_crop_sld
created new section only for complete example
Merge branch 'master' of github.com:geosolutions-it/crop-information-portal