sort optgroup demo and add ungrouped options

Author: joshstoik1

demo/index.html

@@ -58,6 +58,8 @@
 	id="select-3"
 	data-blobselect-placeholder="Eat Something"
 	data-blobselect-placeholder-option="None of the Above"
+	data-blobselect-order-type="string"
+	data-blobselect-order="asc"
 	>
 	<optgroup label="Fruit">
 		<option value="apples">Apples</option>
@@ -69,6 +71,9 @@
 		<option value="carrots">Carrots</option>
 		<option value="lettuce">Lettuce</option>
 	</optgroup>
+	<option value=""></option>
+	<option value="ungrouped-eggplant">Eggplant</option>
+	<option value="ungrouped-dates">Dates</option>
 </select>
 
 <!-- OPTGROUP MULTIPLE EXAMPLE -->