[SQLUtils] Fix wrong reference count of ItemData
[DBAgentMySQL] Plug a memory leak in getLastInsertId()
[FaceRest] Call soup_server_remove_handler() explicitly

It seems that user_data passed to the SoupServer by
soup_server_add_handler() is leaked. Althouth it's not serious,
I fix it to make easy to read valgrind's report.
[server][main] Plug some trivial memory leaks
[ConfigManager] Fix a memory leak of GOptionContext
[FaceRest] Plug a memory leak on an error case of Impl::queueRestJob()
Merge pull request #747 from project-hatohol/fix-memory-leaks

Fix memory leaks