Add interface definition of ws_value_named_value type
Add stubs for ws_value_named_value type
Add implementation for ws_value_named_value_init()
Add implementation for ws_value_named_set_name()
Add implementation for ws_value_named_set_value()
Add implementation for ws_value_named_get_name()
Add implementation for ws_value_named_get_value()
Add implementation for ws_value_named_cmp()
Add CMakeLists.txt entry
Merge pull request #100 from matthiasbeyer/add-value_named

Add implementation for ws_value_named_value type