Remove hardcoded data filename

[yevgenybulochnik]

Currently to load data into the database a file must be present in data/. This file name is currently hardcoded. I would suggest we come up with a solution to remove this dependency. This issue is likely dependent on #15

[finish06]

I think a step further would be to scrap the OpenFDA website and pull the zip file. Then we know we are working with the most up to date data.

[yevgenybulochnik]

@hl1 do you want to take a crack at this once we figure out #15

[hl1]

@yevgenybulochnik I will take care of this.. keep it open for now. I need this to go to master first: #18