Immutable.Stack does not deserialise

[timmy-wright]

Hey,

Just noticed that Immutable.Stack doesn't appear to deserialise properly (or serialise - not sure which side the issue is on). Our use case is: big legacy redux store that we're serialising and we don't really want to change the stack to a list because the bit of code that uses a stack is old and everyone is scared.

Tim

[glenjamin]

Good spot, should be an easy fix to add it to the serialiser list.

Will take a PR

[timmy-wright]

PR is #44