use 127.0.0.1 for test server to switch off possible usage of ipv6

Inets httpd used as a test server tries to use ipv6 by default - see
http://erldocs.com/R16B03-1/inets/httpd.html .
Some machines can have ipv6 layer misconfigured which screws tests suite.
By using raw IP number httpd switches to ipv4. It has also a benefit
that it virtually makes a chance to have it working on Windows where
localhost name is usually not configured in the resolver.
test cases for issue #4
fix double utf8 conversion

See https://github.com/HashNuke/hound/issues/4