Added placeholder prop.#16

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eparh wants to merge 4 commits intoleonardowf:masterfrom

Commits on Oct 4, 2017

Added placeholder
Yauheni Parkhomenka
committed

Commits on Oct 5, 2017

Fixed value issue.
Yauheni Parkhomenka
committed

Commits on Oct 31, 2017

Fixed bug with zero value
Yauheni Parkhomenka
committed

Commits on Nov 23, 2017

Made prop value not required
Yauheni Parkhomenka
committed