Throwing a runtime exception if failing to invoke a member found via …

…reflection. Fixes #81

src/main/java/com/mitchellbosecke/pebble/node/expression/GetAttributeExpression.java

@@ -171,8 +171,7 @@ private Object invokeMember(Object object, Member member, Object[] argumentValue
                 }
             }
         } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
-            e.printStackTrace();
-
+            throw new RuntimeException(e);
         }
         return result;
     }