Added gdp,baro, wea and fcurve datasets.
Added bridge(), forecast() and summary() functions.
Supports target variables on monthly, quarterly and yearly frequency, and indicator variables on daily, weekly, monthly, quarterly and yearly frequency.
Supports auto.arima, ets and other methods for indicator variable forecasting.
Supports aggregation of indicator variables to match the target's frequency using custom weighting functions, exponential Almon polynomials and other methods.