Add metadata file.
Merge pull request #1 from danieljames/metadata

Create metadata file.
added serialization capabilities
matched changes in in-development version of helper support API
fixed https://svn.boost.org/trac/boost/ticket/10439
Merge branch 'develop'
stopped explicitly providing serialization helper support instance id: this is consistent with the current state of Boost.Serialization in master branch *and* its planned evolution in develop branch (which will be eventually merged here, hopefully in time for Boost 1.57)