Insert the options dropdown after options select, rather than body

The current implementation of the DataSift options dropdown has the element ```.jcsdl-operators-dropdown ``` appended to the ```body```. This makes the dropdown cover other elements on the page and creates a lot of empty space below the main JCSDL container.

This request is to place the dropdown element inline, and insert it right after the operators select box, ```.jcsdl-filter-value-input-operators```

![datasift_dropdown](https://f.cloud.github.com/assets/1161699/1835333/eab59f06-73ed-11e3-9dff-4a7d5528f4be.jpg)