Commits on Feb 16, 2016

1. add new feature in children api …

   Now you can filter the childrens by a number, which would be equivalent to use the `at()` method.
   
   `.children(0)` === `children().at(0)`;
   
   update the children docs
   
   remove comment
   
   update the api
   
   This commit undo the changes I've done to the `children` method, and created a new method named `childAt`.
   
   update the docs
   
   update docs and test description
   
   update api and tests
   
   update docs

   

   mauriciosoares committed Feb 16, 2016
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