title: Convert a SQL type into something else in Speedment
body: <p>When Speedment generates entities from a database schema, is there some way to change the default type being generated? For an example, if I have a table like this:</p>
  
  <pre><code>create table comment (
      id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
      author_name VARCHAR(40) NOT NULL,
      posted_date TIMESTAMP NOT NULL
  );
  </code></pre>
  
  <p>By default Speedment will generate the TIMESTAMP column as java.sql.Timestamp. Can I make it so that TIMESTAMP columns are converted into Java long values instead?</p>