Fix for countdown

[Pivotal Tracker](https://www.pivotaltracker.com/story/show/68449846) - Alternative to https://github.com/AgileVentures/WebsiteOne/pull/324

* Added specs to `specs/views/visitors/index...` and scenario to `features/event_countdown...` to check for '-1h' when event is planned within 23h. 
* Changed the `distance_to` method in `config/datetme_extension.rb` following [Sampritis](https://github.com/sampritipanda) suggestions. Great job!

* Fixed failing scenario in  `features/events...` caused by summer time change by setting the events TMZ to UTC. That reflects the apps logic as it is configured right now (Events are NOT set up with custom time zones at this moment)