Integrated Eventbrite API, basic events index

The events controller performs an Eventbrite API search for events
organized by YoPro Global (something we may want to change) and prints
out a very basic set of information in the view. This is merely a demo
implementation and shouldn't be taken too seriously. Lots of things like
layout, number of events, and event caching (to avoid API ratelimiting)
need to be considered before proceeding in production. Also each
environment has an ENV eventbrite setting for the API key.
Added a caching layer to the Eventbrite API

Eventbrite API requests now get routed through the rails caching layer,
which decides if an actual request should be made to the API based on
the recent value's expiration. Eventbrite has a small (1000) request
limit.
Fixed API caching configuration
Reworked events page to use countdown widgets

The events page now uses 4 countdown widgets side-by-side. I also fixed
the sorting issue to go by the actual event start date now.
Updated cache logging event statements.:
Merge pull request #2 from YoPro/feature/bem-eventbrite-integration

Feature/bem eventbrite integration