Replaced 'load' keywords with 'require' for the modules. Added extra currency codes of interest.
Introduced parsing of Zaba PRN files.
Renamed fetch_rates to fetch_rates_oer for "Open Exchange API".
Added method for storing complete Rate objects.
Fixed bug not parsing date in PRNs. Increased parsing robustness.
Completed method for fetching and parsing PRN files from Zaba.
Written script for fetching and persisting exchange rates from Zaba.