SIGINT (Ctrl-C) doesn't stop a rebuild

[andreyvit]

When rebuilding after a change, Ctrl-C kills the daemon but not the build. (Ppow quits after the build finishes.)

Steps to reproduce:

1. Write a large Go app that takes a few seconds to rebuild.
2. Run ppow in prep (build) + daemon mode.
3. Make a change and save.
4. While go build is running, hit Ctrl-C.

Expected:

Both daemon and build are immediately killed.

Actual:

Daemon is immediately killed. Ppow waits for the build to finish, then quits.

[dottedmag]

Indeed. This is inherited from modd.

I'll have a look at it soon.