New Module: Timeseries analysis using ARIMA modeling

Pivotal Tracker: 54248646

Additional authors:
    Shengwen Yang <syang@gopivotal.com>
    Rahul Iyer <riyer@gopivotal.com>

Module includes:
    - Training an ARIMA model for non-seasonal univariate time series
    data
    - Forecasting future values in the time series using trained model
    - Grouping and seasonal data are currently not supported and
    are planned for future work