Improve the documentation to tell how to set token manually with OAuthToken

[sinsunsan]

I wanted to set the token manually without having to use oauth API function but rather manually with OAuthToken service.
It took me quite some time, that it was so simple as

OAuthToken.token = data.token;

Where data.token is the token with token info coming from my api
In my case something like

token: {
 access_token:"YmJhODg5MGM3NDZlNTA4MjA4ZDU0NzViYTcxOGZjZGRmMGQ2NzE2ZDNjYTk5ODk0NDM4NzdjMzFjMjg1YzM0NQ",
expires_in: 3600,
refresh_token:"NWY1YjUyMzY3NTc0NjdiNTBlNDFkMGFkZWYxNjBlMjdjNzA5MDcxYzgwZjExNTc2Zjg0NzExNDE4YzU1Mzg2Nw",
scope: null,
token_type: "bearer"
}

I know it seem evident, but what's not written explicitly is not evident. So I suggest you add it in your doc.