READ (get) products list from API - backend

Merge pull request #23 from MauricioFa/develop

Now products are GET from api (backend)

Basic operator flow completed. Admin test mode

• Mode admin is actived by default.
• There is still no method to change admin mode to operator
• CRUD products, customers and orders are using react-redux, it's not connected the backend api.
• There are no specific methods for reports.

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v2.0.1-beta

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MVP - Operator Flow Completed - without alert inStock

Great job POSTIC team