add README.md for config_server
add develop.json for stored script development
add description about /maintenance file into config_server/README.md
add description about device_type, title_app_version into config/server/README.md
remove comma which raises JSON parse error
Merge branch 'app_release' into develop
use fontana_client_support-0.5.0 to use config server with `sudo rake config_server:daemon`