Off by one error when searching selected option by a string key

[ZeroOne3010]

In jquery.easydropdown.js around line 322 there is this command:

index = self.$select.find('option[value='+index+']').index() - 1;

The .index() function, however, returns a zero-based index, so results returned by that function are off by one.

You should be able to replicate this bug by creating some structure like this:

<select class="dropdown" id="my-foo-select">
<option value="first">First item</option>
<option value="second">Second item</option>
<option value="third">Third item</option>
</select>
<script type="text/javascript">
$(function() {
  $("select#my-foo-select").easyDropDown("select", "third");
});
</script>

Notice how the script should select the third item, but in reality the second item will get selected.