Currently if you run mix cmd on an umbrella app, it runs the cmd on each 
child app. You can't currently use mix cmd on an umbrella to run the 
command once at the top level. I was thinking about submitting a PR with a 
`cmdu` task that runs the specified command at the umbrella level.

For example, I attempted the below mix alias and it resulted in the second 
part of the alias running once for each of the child apps instead of once 
at the umbrella level:

coverage_report: ["coveralls.html --umbrella", "cmd open 
cover/excoveralls.html"]

-Mike Binns
GitHub: TheFirstAvenger

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