Remove code that falls back to attempting to initialize session store w/ `express` (rather than `express-session`)
Remove code that falls back to attempting to initialize session store w/ `express` (rather than `express-session`)

This code was there to support Express 3-compatible session adapters, and we don't have Express 3 anymore.

rlugojr/sails,rlugojr/sails,balderdashy/sails