Add new fields to web_hooks table.

Next fields were added:
* push_events
* issues_events
* merge_requests_events

Main goal is to create web hooks that can be triggered only for certain
event types. For example you can have separate web hook for push events
and another one for issues.
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

db/migrate/20131202192556_add_event_fields_for_web_hook.rb

+class AddEventFieldsForWebHook < ActiveRecord::Migration
+  def change
+    add_column :web_hooks, :push_events, :boolean, default: true, null: false
+    add_column :web_hooks, :issues_events, :boolean, default: false, null: false
+    add_column :web_hooks, :merge_requests_events, :boolean, default: false, null: false
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20131112220935) do
+ActiveRecord::Schema.define(:version => 20131202192556) do
 
   create_table "broadcast_messages", :force => true do |t|
     t.text     "message",    :null => false
@@ -338,6 +338,9 @@ ActiveRecord::Schema.define(:version => 20131112220935) do
     t.datetime "updated_at",                                       :null => false
     t.string   "type",                  :default => "ProjectHook"
     t.integer  "service_id"
+    t.boolean  "push_events",           :default => true,          :null => false
+    t.boolean  "issues_events",         :default => false,         :null => false
+    t.boolean  "merge_requests_events", :default => false,         :null => false
   end
 
   add_index "web_hooks", ["project_id"], :name => "index_web_hooks_on_project_id"