Fix db schema

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150625153454) do
+ActiveRecord::Schema.define(version: 20150620233230) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -344,14 +344,6 @@ ActiveRecord::Schema.define(version: 20150625153454) do
   add_index "oauth_applications", ["owner_id", "owner_type"], name: "index_oauth_applications_on_owner_id_and_owner_type", using: :btree
   add_index "oauth_applications", ["uid"], name: "index_oauth_applications_on_uid", unique: true, using: :btree
 
-  create_table "participants", force: true do |t|
-    t.integer  "target_id",   null: false
-    t.string   "target_type", null: false
-    t.integer  "user_id",     null: false
-    t.datetime "created_at"
-    t.datetime "updated_at"
-  end
-
   create_table "project_import_data", force: true do |t|
     t.integer "project_id"
     t.text    "data"