Add a time expression provider to allow the user to select the predefined ones.#874

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luqp wants to merge 2 commits intoHumanizr:masterfrom luqp:master

+735-58

Commits on Oct 31, 2019

Add a time expression provider for the client to select from the predefined ones.
luqp
committed
Refactor code and add presicion test to time expressions
luqp
committed