Can't find "Expression_Sources"

[rpural]

I cloned the repository, and tried to view the playground pages, but I get the following error:

Playground execution failed:

error: /var/folders/m_/zfndwpq13zl1b9wpb2v5rlz40000gn/T/playground5-d308e6..swift:3:8: error: no such module 'Expression_Sources'
import Expression_Sources

I searched the workbench, and can't find a reference to Expression_Sources at all. I'd appreciate any assistance you might be able to provide.

[mpangburn]

See #3 -- This is a bug with Xcode Playgrounds, though I've provided a temporary workaround.