Add Roll Modification (#61)

Changes:
 + add roll Mod (only for attributes)
 + check for roll mods when rolling on attributes

templates/sheets/partial/mod.hbs

@@ -36,6 +36,7 @@
 						{{#select mod.operation}}
 							{{#if (eq mod.type "attribute")}}
 								<option value="add100">{{localize "midgard5.mod-operation-add100"}}</option>
+								<option value="roll">{{localize "midgard5.mod-operation-roll"}}</option>
 							{{/if}}
 							<option value="add">{{localize "midgard5.mod-operation-add"}}</option>
 							<option value="set">{{localize "midgard5.mod-operation-set"}}</option>
@@ -48,7 +49,7 @@
 				</td>
 
 				<td>
-					<input name="data.mods.{{modId}}.value" type="text" value="{{mod.value}}" data-dtype="Number" />
+					<input name="data.mods.{{modId}}.value" type="number" value="{{mod.value}}" data-dtype="Number" />
 				</td>
 			</tr>
 		{{/each}}