Add Query: species sampled per country

[birbjam]

Can we also get a query per country, maybe something like:
{ 'country': 'Spain', 'speciesSampled': [ {'scientificName': 'Anaxyrus americanus', 'samplesCollected': 80, 'bdTested': 75, 'bsalTested': 5, bdPositive': 25, 'bdNegative': 50, 'bsalPositive': 2, 'bsalNegative': 3}] }
In reference to issue #41.

[birbjam]

@jdeck88 I think it would be fine to just have the species tested per country. I should be able to get diagnostic data from the other json files.