[MC-87040] Shulkers can be pushed inside of each other

If you use a piston to push a shulker, you can use that piston to push another shuker inside of the first one.

World Attached

Environment

Mac OSX 10.10.5
2012 13-inch MacBook Pro

RAM - 4GB DDR3 1600MHz
Graphics - Intel HD Graphics 4000

java version "1.7.0_65"
Java(TM) SE Runtime Environment (build 1.7.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)

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