Removed the unused setting 'session.payload'.

Signed-off-by: Isern Palaus <ipalaus@ipalaus.es>
Merge pull request #1999 from ipalaus/fix/session-payload

Removed the unused setting 'session.payload'.
Merge branch 'develop' of https://github.com/laravel/laravel
Move Page and Widget handling to Lightgear/Content package