Remove unused contact model (#1680)

app/models/contact.rb

@@ -1,15 +0,0 @@
-# Contacts are used only for the contact form on the Huginn website.  If you host a public Huginn instance, you can use
-# these to receive messages from visitors.
-
-class Contact < ActiveRecord::Base
-  attr_accessible :email, :message, :name
-
-  validates_format_of :email, :with => /\A[A-Z0-9._%+-]+@[A-Z0-9.-]+\.(?:[A-Z]{2}|com|org|net|edu|gov|mil|biz|info|mobi|name|aero|asia|jobs|museum)\Z/i
-  validates_presence_of :name, :message
-
-  after_create :send_contact
-
-  def send_contact
-    ContactMailer.send_contact(self).deliver
-  end
-end

db/migrate/20140813110107_set_charset_for_mysql.rb

@@ -3,7 +3,6 @@ class SetCharsetForMysql < ActiveRecord::Migration
     @all_models ||= [
       Agent,
       AgentLog,
-      Contact,
       Event,
       Link,
       Scenario,
@@ -23,7 +22,6 @@ class SetCharsetForMysql < ActiveRecord::Migration
         all_models.each { |model|
           table_name = model.table_name
 
-          # `contacts` may not exist
           next unless connection.table_exists? table_name
 
           model.columns.each { |column|