host: Remove dead code.

First interface isn't used anymore, the second one was used for mocking in unit
tests.

Signed-off-by: Blaž Hrastnik <blaz.hrast@gmail.com>
Merge pull request #579 from flynn/remove-dead-code

host: Remove dead code.
slugbuilder: Use npm-next branch of nodejs buildpack

This installs a newer, less broken version of npm.

https://github.com/heroku/heroku-buildpack-nodejs/compare/v60...fae41898 

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Merge pull request #583 from flynn/npm-next

slugbuilder: Use npm-next branch of nodejs buildpack
test: Add logging to test/apps/signal

Signed-off-by: Lewis Marshall <lewis@lmars.net>
test: Remove docker backend reference

Signed-off-by: Lewis Marshall <lewis@lmars.net>
test: Dump logs from all booted instances

Signed-off-by: Lewis Marshall <lewis@lmars.net>