title: Complex WHERE-clause in Droidparts doesn't work
body: <p>I need complex WHERE clause.</p>
  
  <pre><code>final Where where1 = new Where("col_1", Is.IN, "1, 2, 3");
  final Where where2 = new Where("col_2", Is.IN, "a, b, c");
  final Where where = where1.and(where2);
  </code></pre>
  
  <p>but in result i got </p>
  
  <pre><code>SELECT on table 'table', selection: 'col_1 IN (?) AND (col_2 IN (?))',
  selectionArgs: '[1, 2, 3, a, b, c]', columns: 'null', orderBy: 'null',
  groupBy: 'null', having: 'null', distinct: 'false', limit: 'null'.
  </code></pre>
  
  <p>as you see all arguments are put together and result fails.</p>