Updated SessionMiddleware to conform to updated Middleware protocol
Updated SessionMiddleware to conform to updated Middleware protocol

kdawgwilk/vapor,mpclarkson/vapor,LoganWright/vapor,vapor/vapor,qutheory/vapor,kdawgwilk/vapor,vapor/vapor,qutheory/vapor,kdawgwilk/vapor,vapor/vapor,vapor/vapor,qutheory/vapor,LoganWright/vapor