Retrieves daily wind and solar curtailment data from PDFs posted on CAISO's website (http://www.caiso.com/informed/Pages/ManagingOversupply.aspx#dailyCurtailment) and converts it to CSV format.
Data date range: June 30, 2016 to Present
To Do:
- Merge downloaded hourly data about curtailment type with 5-minute curtailment MW data (code starting line 80)