save exit status of child via SIGCHLD handler and waitpid(3)
may be race-y due to always storing latest in global. might want to use
a map of some sort.
use a PID -> exit code map to avoid race conditions.
demonstrate fetching exit status
zap status property which krept in.
call node/libuv's SIGCHLD handler.
fixing interoperability with native child_process. also added tests
Merge pull request #1 from jaredly/master

fixing interoperability with native child_process. also added tests
must set exit status correctly
set SA_NOCLDSTOP flag for SIGCHLD handler
node 0.10 compatibility
adding travis
missed test file
Merge pull request #2 from jaredly/master

check the sigchld handler
Merge branch 'niallo-waitpid'

Conflicts:
	src/unix/pty.cc