capistrano v3.1 compatible improve: dependency solve

[crhan]

• solve dependency problem from capistrano/capistrano@a58bb3bca2b
• compatible with capistrano v3.1 (not released yet)

[seuros]

What is the advantage of this refactoring ?

[crhan]

1. in capistrano 3.1, after and before will immediately looking for the given task(see commit capistrano/capistrano@a58bb3b). That makes the after hook must be invoked after the task declared
2. make 4 lines to 1 line
3. After capistrano 3.1, you can write after 'deploy:finished', :smart_restart here(without current namespace 'puma'). But for the backward compatible, still use full name here