Implement Laravel tests (tback#8)



* Add a first (failing) test for LaravelMiddleware.

* Inject LpeManager, make Middleware testable.

Merge branch 'fix-laravel-route'

Update README.md

Merge the default config with the project config. (tback#6)

Add lumen support and a manger to create metrics. (tback#5)

Lumen compatibility.

Add illuminate/htttp to require-dev.

Measure latency with microsecond precision. (tback#2)