change all methods to use options object
add tradeOfferId param for loadPartnerInventory
HTTPS only
debug message
better handling of results and errors in acceptOffer
add a small timeout in case of error in loadInventory
do not re-download API Key if already loaded
update request
getAPIKey and loadInventory no longer auto-retry on error
update README
add language param for loadInventory methods
update README
1.0.0