delay on detect change

[foliodev]

To support sftp programs where it uploads the files remotely.
To prevent EOF error.

[kataras]

rizla -delay=5s main.go for example, it will wait 5 seconds for reload and will also skip any changes that will happen in that time in order to not build two executable in the same or near to time, file changer works concurrently.

You can use ms as well, so maybe -delay=250ms is a better option for your needs, play with these, for more details on what string you can pass for a duration check here: https://golang.org/pkg/time/#ParseDuration

You can also pass arguments to your program(s), example: https://github.com/kataras/rizla/blob/master/_examples/main.go as requested at rizla issue 13.