1.2.0 to 2.1.3 backport missing

[nluk]

Hi, some minor changes introduced in the 1.2.0 version haven't been backported to the 2.1.3 version. The ones I've found are:

1. 2.1.3 com.amazon.sqs.javamessaging.message.SQSMessage::setJMSDeliveryTime and ::getJMSDeliveryTime have a FIXME comment, while in the v1 a field was added
2. 2.1.3 com.amazon.sqs.javamessaging.SQSConnectionMetaData defines JMS version as 1.1, but depends on jms-api 3.1.0. v1 metadata was updated to 3.1.

There are also quite a few improvements to the comments, and minor code adjustments. But nothing noteworthy.

Come to think of it, it's not a backport, is it? Still, those changes should probably be forwarded to 2.x.x.