title: Clear all filters remove the custom filter options
body: <p>When I click the <code>clear all filters</code> option from the table menu, filter data gets cleared and worked fine, but it has cleared the custom filter option I have added for two column fields. After then, custom filters are not working based on the conditions I have added. Please find the sample code I have created in <a href="http://plnkr.co/edit/hDqtdzpfRfkDptxBERsb?p=preview" rel="nofollow">Plunkr</a></p>
  
  <p>In the provided sample code, age filters are working fine based on the filter conditions added. When selecting the <code>clear all filters</code> option, it clear all the filter text entered, after then text entered in age filter ie: greater than or less than is filtered based on default <code>contains</code> only and the custom filter I have added was not filtered anymore. It should be a major bug in business perspective.</p>