[MRG] Improvements to datasets submodule

[joaopfonseca]

Closes #18;

TODO:

• Add more dataset information in summarize_datasets
• Add test module to summarize_datasets

[joaopfonseca]

NOTE: Hosting raw data from the datasets submodule elsewhere will be dealt with in the future.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.48%. Comparing base (ab0dcd7) to head (599c510).
Report is 97 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #26   +/-   ##
=======================================
  Coverage   87.48%   87.48%           
=======================================
  Files          20       20           
  Lines         743      743           
  Branches      156      156           
=======================================
  Hits          650      650           
  Misses         75       75           
  Partials       18       18           

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