Guard Against Looking Up Private IP's

Added regexp guard to prevent looking up any private IP address range and loopback address.

IPv4 Private range: https://www.rfc-editor.org/rfc/rfc1918.txt
IPv6 Unique Local range: https://www.rfc-editor.org/rfc/rfc4193.txt
Avoid Displaying () Brackets in Handlebars Template

When the API returned no item for shortloc brackets were still displayed. Added conditional statement.
Add Tests for Private IP Ranges

New tests for IPv4 and IPv6 addresses
Merge pull request #1243 from chrisjwilsoncom/iplookup-fixes

Guard Against Looking Up Private IP's