Use jasny/php-functions v2, v3 or v4

Require jasny/php-functions v2 or v3

Revive request for error page

Run travis tests for PHP 7.1

Merge pull request #20 from jasny/errorpage

Fix ErrorPage middleware

Merge pull request #19 from jasny/strict-controller-class

Be strict on translating controller property to class name

Merge pull request #18 from jasny/controller-runner-namespace

Use an array as `controller` property to specify the namespace

Fix tests

Fix issue with Routes\Glob not working with full url

Merge pull request #13 from jasny/fix-tests

Fix tests