Add Description to bottom of rolls (#19)

Changes:
 + Add helper to strip Html
 + add description of items to bottom of roll

templates/chat/roll-m5.hbs

@@ -90,5 +90,11 @@
 				{{/each}}
 			</tbody>
 		</table>
+		{{#if i.description}}
+			<tr>
+				<h2 class="roll-description-header">Beschreibung:</h2>
+				<span>{{stripHtml i.description}}</span>
+			</tr>
+		{{/if}}
 	</div>
 </div>