(fix) Change over to current Iron API.
(doc) Show separate before and after linking in examples
(fix) incorporate pull-request suggestions

Rename Logger::middlewares to Logger::new.
Use a private type as start-time key.
Clarify examples.
(chore) deny(warnings)
(refactor) Use Logger for both before and after.
Merge pull request #38 from duelinmarkers/bug/work-with-new-iron-api

Fix to work with new iron api