mobxjs / mobx-state-tree / 891

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Pull #447

travis-ci

Fix for not being able to add to a map when using environments

Basically I stumbled upon a problem while trying to add a node to a map of a map when using environments, failing saying that the environments were not the same.

The newParent environment was undefined and this._environment was correctly set.
Upon checking getEnv (which was actually giving the proper value) I found out that the proper way to get a node environment is to use node.root._environment, and thus this fix.

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