deprecation warning when running donejs build

@matthewp commented on [Tue Jan 31 2017](https://github.com/donejs/donejs/issues/785)

```
(node:52066) DeprecationWarning: os.tmpDir() is deprecated. Use os.tmpdir() instead.
```

```
> node -v
v7.4.0
> donejs -V
1.0.0-alpha.0
```

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@phillipskevin commented on [Mon Feb 06 2017](https://github.com/donejs/donejs/issues/785#issuecomment-277738751)

I think this was fixed when we moved to yeoman 1.0. Are you still seeing this issue, @matthewp?

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@matthewp commented on [Mon Feb 06 2017](https://github.com/donejs/donejs/issues/785#issuecomment-277739715)

I see it when running donejs build.

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@phillipskevin commented on [Mon Feb 06 2017](https://github.com/donejs/donejs/issues/785#issuecomment-277762350)

Ok, I do see this still, but only after running `donejs add nw`.

Reproduce the warning by running `donejs add nw` followed by `donejs build` with the reported Node and DoneJS versions. Trace where the `os.tmpDir()` deprecation is introduced during that workflow. Done means the build completes without this deprecation warning.

Written by the indexing model from the issue text.