#1166 Changed visibility from protected to public

I hope I'm doing it right
Update manager.c(cherry picked from commit 226a7dc9783a10a6e257060e140fa98087125340)
Update model.c

Phalcon\Mvc\Model::setup() docs supplemented by available options(cherry picked from commit abcf5bb9b5be7082b35ab97bd6f7e4a4b9a56b1c)
add double type for column.c
(cherry picked from commit 4aaa1fe5ed38764bdb9fa4472e9c94470933d8a5)