* [33: Create a command to generate a short code charset by randomizing the default one](https://github.com/acelaya/url-shortener/issues/33)
* [15: Return JSON/HTML responses for errors (4xx and 5xx) based on accept header (content negotiation)](https://github.com/acelaya/url-shortener/issues/15)
* [21: Allow to filter visits by date range](https://github.com/acelaya/url-shortener/issues/21)
* [22: Save visits locations data on a visit_locations table](https://github.com/acelaya/url-shortener/issues/22)
* [20: Inject cross domain headers in response only if the Origin header is present in the request](https://github.com/acelaya/url-shortener/issues/20)
* [11: Separate code into multiple modules](https://github.com/acelaya/url-shortener/issues/11)
* [18: Group routable middleware in an Action namespace](https://github.com/acelaya/url-shortener/issues/18)
**Tasks**
* [36: Remove hhvm from the CI matrix since it doesn't support array constants and will fail](https://github.com/acelaya/url-shortener/issues/36)
* [6: Remove dependency on expressive helpers package](https://github.com/acelaya/url-shortener/issues/6)
* [30: Replace the "services" first level config entry by "dependencies", in order to fulfill default Expressive name](https://github.com/acelaya/url-shortener/issues/30)
* [9: Use symfony/console to dispatch console requests, instead of trying to integrate the process with expressive](https://github.com/acelaya/url-shortener/issues/9)
* [8: Create a REST API](https://github.com/acelaya/url-shortener/issues/8)