0. add description of empty () for list_of(), list_inserter.
1. add repeat description

3. docs may mention whether hash_map/set can be used
   as well as upcoming boost::unordered_map/set.

  Maybe exotic containers as circular_buffer and/or
  multi index container can be shown in example as well.

4. update docs wrt member function addresses + std namespace
5. update email example to use a local functor

6: find conversion problem in g++ with nested list_of().
7. add repeat etc to header overview.