Use JDBC Escape syntax for MySQL Date / Time literals to circumvent a known MySQL bug

[lukaseder]

We should revert #1253 only for MySQL because of this bug here:
http://bugs.mysql.com/bug.php?id=69233

According to the documentation, it seems that the MySQL parser itself also supports this escape syntax, so reverting is fine for MySQL:
http://dev.mysql.com/doc/refman/5.7/en/date-and-time-literals.html

The original bug report was brought to us by Gunther here:
https://groups.google.com/forum/#!topic/jooq-user/eXkHOFTbUZs