GSoC 2019-Installing committed datasets

Hey everyone,

With the end of the 6th week we are now in the mid of GSoC 2019.

Last two weeks I was mostly involved with life but I was able to work on the installation of committed datasets using retriever. Now it’s possible to commit datasets using retriever and install the committed dataset back to the database of your choice. Currently, it is working for only datasets with JSON scripts. For supporting datasets with .py scripts the scripts will have to be modified because they override the download function to perform extra processing.

I have already opened a PR for the above work. I am still working on adding the test.

Usage example:

retriever install sqlite portal-b8b17d.zip

from retriever import install_csv
install_csv('portal-b8b17d.zip')

As you can see there are no new commands for installation of committed dataset. The user just needs to provide the path to the committed zip file and everything else remains the same. After the above work gets merged the major part of the project will be done.