Material Design dropshadow

[mschipperheyn]

Not sure if this is possible yet in RN, but it would be nice to have the Material Design style drop shadow on the button

[duranmla]

+1 my first though was that this module take care of that detail (which is in the end it is something quite important). Will be helpful to be able at least to set the elevation of the button and supporting 5.0 +

[zicjin]

it is possible to have elevation style in android and shadow style in ios

[jankalfus]

Pull request #72