Add FetchGraph function
Add FetchGraph function

This is a function to walk an IPFS directory and return the CID of each file
or sub-directory contained inside.

hoffmabc/openbazaar-go,OpenBazaar/openbazaar-go,OpenBazaar/openbazaar-go,gubatron/openbazaar-go,OpenBazaar/openbazaar-go,gubatron/openbazaar-go,gubatron/openbazaar-go,hoffmabc/openbazaar-go,hoffmabc/openbazaar-go