Add ipv6 support

lib/moped/address.rb

@@ -28,8 +28,15 @@ class Address
     # @since 2.0.0
     def initialize(address, timeout)
       @original = address
-      @host, port = address.split(":")
-      @port = (port || 27017).to_i
+
+      if (parts = address.match(/\[(.+)\]:?(.+)?/))
+        @host = parts[1]
+        @port = (parts[2] || 27017).to_i
+      else
+        @host, port = address.split(":")
+        @port = (port || 27017).to_i
+      end
+
       @timeout = timeout
     end
 
@@ -49,7 +56,7 @@ def resolve(node)
         return @resolved if @resolved
         Timeout::timeout(@timeout) do
           Resolv.each_address(host) do |ip|
-            if ip =~ Resolv::IPv4::Regex
+            if ip =~ Resolv::IPv4::Regex || ip =~ Resolv::IPv6::Regex
               @ip ||= ip
               break
             end

spec/moped/address_spec.rb

@@ -83,11 +83,11 @@
       end
 
       it "sets the resolved address" do
-        expect(address.resolved).to eq("127.0.0.1:27017")
+        expect(address.resolved).to satisfy { |a| a == "127.0.0.1:27017" || a == "::1:27017" }
       end
 
       it "sets the ip" do
-        expect(address.ip).to eq("127.0.0.1")
+        expect(address.ip).to satisfy { |a| a == "127.0.0.1" || a == "::1" }
       end
     end