Add quiet mode.

[crossbrowsertesting]

Add quiet mode.

[rosesandhello]

A variation on your pull request will be considered for a future version.

[shackijj]

Why the issue was closed? Is it solved?

[rosesandhello]

Added in latest commit. Will be incorporated in next release.

[shackijj]

The problem was not solved.

This how i tested it.
`const cbt = require('./cbt-tunnel-nodejs/tunnel_start');

cbt.start({
username: 'BOO',
authkey: 'FOO',
},
(err) => {
if (err) {
console.log('CBT tunnel is failed', err);
process.exit(1);
}
console.log('CBT tunnel is up');
console.log('Wait for tunnel registratiuon');

    setTimeout(() => {
        console.log('CBT setup is done');
        cbt.stop();
    }, 5000);
});

`

The output should be:

Getting account info...
Got user account info!
POST request to CBT for a tunnel...
Posted!
Started connection attempt!
Connecting as simpleproxy...
PUT request to CBT finalizing tunnel...
PUT request successful!
Completely connected!
CBT tunnel is up
Wait for tunnel registratiuon
CBT setup is done
Bye!

Currently, when I call .stop method application writes to stdout (see screenshot below)

Please keep the issue open while it's not solved and released.

Btw, you can give feedback on #9.

[rosesandhello]

Give the latest commit a go.

[shackijj]

It works. Thank!