Adding application.rb which is overriding capistrano application class to avoid calling private method ‘load_imports’.
Capistrano team removed private ‘locad_imports’ on v3.1.0 tag. https://github.com/capistrano/capistrano/commit/1f86d32fd48d08311b92446e1db428613b180309
but, that was not applied to gem build.
Update Capistrano and Capitomcat dependency version. and some cleanings