move deletion of InternalSubscription to asio service to make sure timer does not run with pointer to delete objects
remove unused methods
Merge branch 'master' of github.com:FreeOpcUa/freeopcua
InternalSubscription keeps shard_ptr on itself until timers stops
revert 5b17a1, keep shared_ptr in timer lambda
Merge pull request #84 from oroulet/master

make sure timer does not run with pointer to delete objects