Uses a SteemConnect refresh token
        to retreive an access token

def get_token(self, code=None):
        ''' Uses a SteemConnect refresh token
        to retreive an access token
        '''
        tokenobj = self.steemconnect().get_access_token(code)
        for t in tokenobj:
            if t == 'error':
                self.msg.error_message(str(tokenobj[t]))
                return False
            elif t == 'access_token':
                self.username = tokenobj['username']
                self.refresh_token = tokenobj['refresh_token']
                return tokenobj[t]