Added skip_status parameter to verifyCredentials

[NachoSoto]

Explained here: https://dev.twitter.com/docs/api/1/GET/account/verify_credentials

[fent]

The callback should be the last argument in the function. This is standard node async function design.

[NachoSoto]

I wanted to keep backwards compatibility, but you are right. Should I change it?

[fent]

You could make skip_status argument optional.

if (typeof skip_status === 'function') {
  callback = skip_status;
  skip_status = false;
}

[NachoSoto]

Of course :-) thanks.