Support linux better

Using == as a separator is now allowed. It works better in Linux.

Graceful shutdown

Implements graceful shutdown when pressing Ctrl+C and tries to terminate the existing process chain.

Nicer flags and process killing

v0.3

Close io from interrupted process.

With sequence of processes.

0.2

Use ;; for multiple commands.

Beta Release

Good enough to use in day-to-day work.