Added "translate" command

lib/commands/translate.rb

@@ -0,0 +1,28 @@
+module Bot
+    module DiscordCommands
+        module TranslateCommands
+            extend Discordrb::Commands::CommandContainer
+
+            require 'cgi'
+            require 'nokogiri'
+            require 'capybara/poltergeist'
+
+            command(:translate, usage: 'translate <文字列>', description: '日本語に翻訳') do |event, query|
+                query = CGI.escape(query)
+                url = "https://translate.google.com/#auto/ja/#{query}"
+
+                Capybara.register_driver :poltergeist do |app|
+                    Capybara::Poltergeist::Driver.new(app, {:js_errors => false, :timeout => 100 })
+                end
+
+                session = Capybara::Session.new(:poltergeist)
+                session.visit(url)
+
+                doc = Nokogiri::HTML(session.html)
+                result = doc.css('#result_box').text
+
+                event.respond result
+            end
+        end
+    end
+end