Return UUID from ResultSet#getObject()

[harawata]

Currently, to retrieve UUID from a ResultSet, users have to call getBytes(column) or getString(column) depending on the column type, and convert the result if they want an instance of java.util.UUID.
This PR allows users to call getObject(column, UUID.class) instead.

I already signed OCA for my earlier PR.
#36 (comment)

[mysql-oca-bot]

Hi, thank you for your contribution. Please confirm this code is submitted under the terms of the OCA (Oracle's Contribution Agreement) you have previously signed by cutting and pasting the following text as a comment:
"I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it."
Thanks

[harawata]

I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

[mysql-oca-bot]

Hi, thank you for your contribution. Your code has been assigned to an internal queue. Please follow
bug http://bugs.mysql.com/bug.php?id=117579 for updates.
Thanks