Add support for additional group information

See koraktor/steam-condenser#225
Update test fixture for new group data
Also load the URL from group data
Test all group attributes
Fix encoding of test_steam_group.rb for Ruby 1.9
SteamId requires the 'time' stdlib

We use `Time.parse`.
Improve handling of UTF-8 characters in server replies

This works for Ruby 1.9+. On Ruby 1.8 be sure to set $KCODE to 'UTF-8'.
Version bump to 1.3.8
Merge branch '1.3-stable'
Relax runtime dependencies
Ensure Ruby 1.8 does not try to install mime-types 2.0.0
Enable fast finish on Travis CI
Test on Ruby 2.1.0
Also test on JRuby HEAD
Version bump to 1.3.8.1
Merge branch '1.3-stable'
Fix typo in master_server.rb comments
Merge pull request #12 from chrisgw/master

Fix typo in master_server.rb comments
Fix SteamGame.check_steam_inf
Ignore unused block variables