title: Point cakephp 3 model to a different table
body: <p>For database organisation purposes, I have added pretext for every table.
  I would then name models in Cakephp without the pretext, for less writing when calling them.</p>
  
  <p>In Cakephp 2 I would use <code>public $useTable = 'dev_pictures';</code> to point "Picture" model to "dev_pictures" table, in Cakephp 3, this has no effect. How would i do it in Cakephp 3?</p>