In all .cpp files, remove using namespace ndn::ptr_lib and explicitly use ptr_lib::shared_ptr and make_shared.
tests: In test-publish-async, explicitly use func_lib::ref. Refs #1090.
Merge branch 'issue/1090-always-use-ptr_lib-with-shared_ptr'. Refs #1090.
http://redmine.named-data.net/issues/1090