Merge pull request #305 from andrewlord1990/master

Add option to set alwaysCallMultiChoiceCallback to AlertDialogWrapper

library/src/main/java/com/afollestad/materialdialogs/AlertDialogWrapper.java

@@ -220,6 +220,11 @@ public class AlertDialogWrapper {
             return this;
         }
 
+        public Builder alwaysCallMultiChoiceCallback() {
+            builder.alwaysCallMultiChoiceCallback();
+            return this;
+        }
+
         private void setUpMultiChoiceCallback(@Nullable final boolean[] checkedItems, final DialogInterface.OnMultiChoiceClickListener listener) {
             Integer selectedIndicesArr[] = null;
             /* Convert old style array of booleans-per-index to new list of indices */