add missing inspect in Console
change the way package.path works on helper

This is because not all middlewares have their file equal to their
folder name. For example yo-api -> yo.lua (without the -api). This
allows making require ‘yo-api.yo’
start working in yo
Do not remove string.rep in sandbox
Move inspect from spec/env to spec
remove magic from package.path
remove unused sandbox.lua file
transform helper into expect-based