VENPromotionsManager是一个iOS库，用以实现基于时间和位置的促销。

它可以在app内简单地定义、管理以及控制基于位置的促销。

功能如下：
Define promotion action events along with trigger locations and active date intervals
Check for location based promotions on a background timer (optional)
Use an included location service built on a CLLocationManager or a custom location service