Added remaining PayPal currency codes and symbols

Order and codes from https://www.paypal.com/cgi-bin/webscr?cmd=p/sell/mc/mc_wa-outside
Unicode decimal symbols from http://www.xe.com/symbols.php
Added remaining PayPal currencies
All PayPal currencies and symbols

Order of symbols checked
Merge pull request #21 from samholford/master

Added remaining PayPal currencies props @samholford