make the linux build import npipe and update dependencies.tsv to re-include npipe.  Now godeps ./... > dependencies.tsv will do the right thing.
Merge pull request #494 from natefinch/fix-npipe

Fix dependencies.tsv and make npipe always a dependency.

All builds now include a dependency on gopkg.in/natefinch/npipe.v2, so godeps ./... > dependencies.tsv will do the right thing.  This required a slight change to the npipe package so it has a file that compiles on non-windows platforms (I just moved the package docs to doc.go).