Minor Bug fixes, notebook examples, and Documentation of added functionality#139

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Youbadawy wants to merge 3 commits intoAI4Finance-Foundation:masterfrom

Youbadawy:master

Commits on Feb 15, 2021

Fetching data across all directories!
Youbadawy
committed

Commits on Feb 17, 2021

Fix Stocks exchanges
Youbadawy
committed

Commits on Feb 18, 2021

Fixed Minor Bugs for Data fetching. Notebooks
Youbadawy
committed