[Request] Download function: Implement where clause

[geneorama]

Allow the user to limit their download to subset by rows.
(Possibly this belongs in R Socrata)

https://github.com/Chicago/food-inspections-evaluation/pull/11/files#r20760611

[geneorama]

I just noticed #4 (Rewrite functions to generate data enhancement). #4 and this issue #19 are very similar. #4 is a little outdated since the "livereadcsv" scripts are gone now, but the idea of subsetting by dates alone is good.
@tomschenkjr should we merge these two issues?

[tomschenkjr]

I do think these issues should be picked-up in the RSocrata development path. You should open some enhancement requests on RSocrata and we can resolve them on that implementation.

[SEV2014]

12/09/14 scrum decision: Port over to RSocrata

[SEV2014]

12/11/14 Request #19 closed in FI eval repo & re-opened in RSocrata as new #11