Change default host to 127.0.0.1

[lvn]

0.0.0.0 is non-routable, and non-visitable in Chrome.

127.0.0.1 is a better default host.

[rayshan]

+1 chrome defaults to a google search with http://0.0.0.0:8080

[dead-claudia]

+1 for the same reason.

Ping @indexzero - this is a bit of an annoyance. It would be easier than my usual command line now:

hs -a localhost

Please merge this ASAP

[yfr]

+1 for the same reason. (copy&paste commenting)

[indexzero]

The approach in #132 is better. The beef here is with the log message and not actually binding to 0.0.0.0. In other words, one could still manually type "127.0.0.1:8080" into Chrome and it would go to the page served by hs.