Setting default ip address to localhost instead of 127.0.0.1

[SethDocherty]

Per testing, I found a discrepancy when using localhost vs 127.0.0.1 where I'm not able to access a CID in the browser via the local IPFS node http gateway.

After some research, it seems like typical approach is to use localhost.

Resources:

1. This mentions localhost as the best practice though it lists 127.0.0.1. Confusing for the reader as it doesn't explicitly say localhost
2. Article that provides some details on the difference. Note that localhost typically resolves to the ip address 127.0.0.1 as to refer to the machine itself.
3. The example links in Step 2 use localhost.