Add supported_protocols to Freegeoip.rb lookup

I uncovered a small issue when switching from Yahoo BOSS to Google (with API, which requires enabling :use_https).  Because the Freegeoip.rb file is missing a supported_protocols method, it attempts to do an https lookup for IP lookups when enabling :use_https.

I already tested this on my setup and it appears to resolve the issue, with lookups/base.rb detecting that https is not supported for Freegeoip

Replace TimeoutError with Timeout::Error

TimeoutError is deprecated in Ruby 2.3.0. It has been an alias for
Timeout::Error starting in Ruby 1.8.0, and should be safe to replace.

Add viewport method to results that provide one

Warn that the Yahoo BOSS Placefinder API is being discontinued.

https://developer.yahoo.com/boss/placefinder/

the Yahoo lookup will be fully removed via:
https://github.com/alexreisner/geocoder/pull/985

Add adapter for geoportail.lu (Luxembourg)

Require lookups only as they are used.

Fix Geocoder::Calculations.endpoint comment

I just spent a few hours trying to get this function to work, then realized I had my parameters in the wrong order. I was following the order listed in the comment, rather than the actual method definition! *facepalm* Anyhow, this fixes the comment, for the next person to read it.

Removed 'LIMIT 1' in maxmind local lookup that prevented from using database index.

For #928

Google geocoder results - expose partial_match and place_id fields

Add place_name and place_type to esri result

This reverts commit 97b6bb94.