Get the token from the first injector which contains it.
Delegates to the first Injector.get().
If not found, then delegates to the second Injector (and so forth).
If no Injector contains the token, return the notFoundValue, or throw.
the DI token
the value to return if none of the Injectors contains the token.
the DI value
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Merge two injectors
This class implements the Injector ng2 interface but delegates to the Injectors provided in the constructor.