Merge pull request #6 from xiejunfeng/master

big update
add comment
Merge branch 'master' of github.com:BullSoft/phalcon-framework
Merge pull request #7 from xiejunfeng/master

update
Merge branch 'master' of github.com:BullSoft/phalcon-framework
Merge pull request #8 from xiejunfeng/master

update
Merge branch 'master' of github.com:BullSoft/phalcon-framework
add social login
Merge branch 'master' of https://github.com/BullSoft/falcon
use session instead cookie
Merge branch 'master' of https://github.com/BullSoft/falcon
update

upate