New async extensions#62

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dnikolovv wants to merge 2 commits intonlkl:developfrom

dnikolovv:async-extensions

Commits on Dec 18, 2018

Added some new async extensions.
Dobromir Nikolov
committed

Commits on Dec 20, 2018

Removed the MatchAsync extensions. Added ToAsync. Sorted alphabetically. Added tests.
Dobromir Nikolov
committed