Handle the case where ENV["EDITOR"] contains space
Handle the case where ENV["EDITOR"] contains space

`system` command actually requires all arguments of a command to be
passed as arguments to the method. This commit fixes an issue where user
may have `ENV["EDITOR"]` that contains arguments in it (such as
`mvim -f`).
balvig/capistrano-fiesta,balvig/capistrano-fiesta,balvig/capistrano-fiesta