Fixes https://github.com/capistrano/capistrano/issues/863

Removed vagrant development dependency.
Merge pull request #864 from jrmyward/fix-development-dependency

Removed vagrant development dependency.
:panda_face: Fixed failed tests

After update to new version of sskit there were a lot of failed tests.
:panda_face: 857: Load tasks from the deploy.rb
Merge pull request #867 from miry/857-deploy-config-load

Load tasks from the deploy.rb
Merge pull request #866 from miry/fix-tests

Fix failed tests