title: Pre- and Post-migration scripts for Flyway
body: <p>I am looking for a way to execute a hook script before and after migration.
  I have a bunch of views and stored procedures and would like the process to be:</p>
  
  <ol>
  <li>Drop all views and stored procedures.</li>
  <li>Run the migration.</li>
  <li>Rebuild views and stored procedures.</li>
  </ol>
  
  <p>This insures that any change to the schema is reflected in related views and stored procedures. Steps (1) and (3) will be bash scripts.</p>
  
  <p>Is this possible in Flyway?</p>