Update AtomSpaceWrapper.cc

updated deprecated 'shared_dynamic_cast' to 'dynamic_pointer_cast' to support latest boost versions
changed shared_dynamic_cast to dynamic_pointer_cast

shared_dynamic_cast was deprecated in boost 1.35 and has been removed in boost 1.53
changed shared_dynamic_cast to dynamic_pointer_cast

shared_dynamic_cast was deprecated in boost 1.35 and has been removed in boost 1.53
Merge pull request #211 from 5aurabhpathak/master

Updated deprecated shared_dynamic_cast to dynamic_pointer_cast