dnu publish doesn't exclude output folder

[muratg]

From @anurse on July 17, 2015 20:2

I was seeing a weird recursive behavior with dnu publish when I did the following:

1. Create a project
2. In the project directory, run dnu publish -o output

Expected: dnu publish finishes and publishes the app properly

Actual: dnu publish crashes with a "path too long" error because it got into a recursive loop continually publishing the output subdirectory.

I need to sanity check that this repros, but I wanted to file it so it didn't get forgotten.

Copied from original issue: aspnet/dnx#2288

[TheRealPiotrP]

This is not an issue in dotnet publish.