Enum instances aren't mounted as Fields

[thejcannon]

Howdy folks!

I've been running into an issue with my enum fields not being in my schema, which I think is because the Enum instance is being skipped when mounting the unmounted fields.

>>> isinstance(Enum('Foo', [('X', 1)]), UnmountedType)
False
>>> isinstance(Int(), UnmountedType)
True
>>> isinstance(Enum('Foo', [('X', 1)])(), UnmountedType)
True

Which has to do with the weirdness of Python enums, but isn't unexpected:

>>> type(Enum('Foo', [('X', 1)]))
<class 'graphene.types.enum.EnumMeta'>
>>> type(Enum('Foo', [('X', 1)])())
<Foo meta=<EnumOptions name='Foo'>>

Unfortunately, the documentation doesn't mention using Enums in relation to fields (Either like a scalar, or as the "type" in a Field) but that's possibly a separate issue.

[thejcannon]

I'm guessing the "solution" here is that Enum(...) defines an Enum, which then must be initialized (which is what the extra parenthesis are for).
If that's the case, I would suggest some documentation telling the user that (in addition to documenting which "call" options such as description= belongs).

[stale]

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