ReadFirstOffset in version [kafka_2.11-1.0.1], got incorrect offset

[sunc-cn]

when I test commit offset explicitly, make a test case that's do not commit offset after call the FetchMessage. I think if restart the consumer, will consume the message that not committed,but the consumer will got new messages which offset than last commited offset

[stevevls]

We will investigate this as part of #115 because we think they're related.