restructured to only return valid turns to the outside + cleanup

include/util/name_table.hpp

@@ -10,14 +10,19 @@ namespace osrm
 {
 namespace util
 {
+
+// While this could, theoretically, hold any names in the fitting format,
+// the NameTable allows access to a part of the Datafacade to allow
+// processing based on name indices.
 class NameTable
 {
   private:
-    //FIXME should this use shared memory
+    // FIXME should this use shared memory
     RangeTable<16, false> m_name_table;
     ShM<char, false>::vector m_names_char_list;
+
   public:
-    NameTable( const std::string &filename );
+    NameTable(const std::string &filename);
     std::string get_name_for_id(const unsigned name_id) const;
 };
 } // namespace util