C++11: N2672 Initializer lists

- Modified code to use the more compact and readable initializer lists.

src/columns/ColID.cpp

@@ -41,10 +41,8 @@ ColumnID::ColumnID ()
   _style      = "number";
   _label      = STRING_COLUMN_LABEL_ID;
   _modifiable = false;
-
-  _styles.push_back ("number");
-
-  _examples.push_back ("123");
+  _styles     = {"number"};
+  _examples   = {"123"};
 }
 
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