New phpunit bootstrap file
Fixed TranslatorTest. Refs #2844

- key argument casted to string
- placeholders are always in the form ${...}
Slider JS widget (_updateView): removed debug() call.
Table view: sort DataTable by file-size, percent, ip-address. Refs #2882

The sorting function can be set by passing an array for the column in
setColumns().  For instance

    $columns = array(
	'Key',
	array(
            'name' => 'size',
            'columnDefs' => array('type' => 'file-size')
        ),
	...
    );