title: is there any way to have redux-form ignore dots in a field name?
body: <p>i have a restful api that accepts dotted(path) strings as parameter keys.</p>
  
  <p>for example, i can call this: </p>
  
  <pre><code>/widgets?material.type=iron
  </code></pre>
  
  <p>so i have a redux-form field like:</p>
  
  <pre><code>&lt;Field name="material.type" component={TextField} label="material type" /&gt;
  </code></pre>
  
  <p>but redux-form interprets the dot in <code>material.type</code> and when passed to my handler ends up as <code>{material: {type: 'iron'}}</code>.</p>
  
  <p>i understand why this is the default behavior, but i was wondering if there is an easy way to thwart it with a property or something such that i can get <code>{'material.type': 'iron'}</code> instead?</p>