Add MySQLCursorPreparedDict option

[lukeweber]

Some like Dict, some like Prepared, but I like both sometimes as well.

MySQLCursorPreparedDict subclasses MySQLCursorPrepared and fetch*() with the desired behavior to map column names to fields in dictionary format.

[mysql-oca-bot]

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[lukeweber]

Hi, thank you for submitting this pull request. In order to consider your code we need you to sign the Oracle Contribution Agreement (OCA). Please review the details and follow the instructions at http://www.oracle.com/technetwork/community/oca-486395.html
Please make sure to include your MySQL bug system user (email) in the returned form.
Thanks

Done

[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:
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[lukeweber]

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=81573 for updates.
Thanks