Changed `doctype 5` to `doctype html` on the example file because the former was deprecated on Jade version 1.0.0.
Merge pull request #1876 from yosssi/dev

Updated the example file to use `doctype html` on  because  `doctype 5` was deprecated on Jade version 1.0.0.
update express jade layout generator

update doctype
Merge pull request #1877 from reqshark/master

update express jade layout generator