Opening hours

Opening hours are now displayed in modal window for those rooms that have opening_hours key set: http://wiki.openstreetmap.org/wiki/Opening_hours

![image](https://f.cloud.github.com/assets/539298/75597/f2fd9054-60cc-11e2-8bfc-b17e47d95a44.png)

This feature uses
jquery-dateFormat plugin: http://archive.plugins.jquery.com/project/jquery-dateFormat
opening_hours.js by Dmitry Marakasov & contributors: https://github.com/AMDmi3/opening_hours.js