Merge branch 'release/v0.3.1' into develop
Fix a missing method error when a service use another service
Add ERB support in YAML loader
Merge remote-tracking branch 'origin/feature/add_erb_support' into develop
Add a file_path option to load specific classes
Merge remote-tracking branch 'origin/feature/add_file_path_loading_option' into develop
Bump to v0.4.0

* Fix an error when a service use another service
* Add ERB support in YAML loader
* Add file_path option
Merge branch 'release/v0.4.0'