Don't load tasks several times in specs

Calling `load_tasks` in several files made rails load the tasks several
times, and so they were executed several times when called.

Since the milestone migration can't be executed twice in a row (it would
fail with duplicated ID records), loading the tasks several times made
the milestone migrations task specs fail.

spec/lib/tasks/communities_spec.rb

@@ -1,15 +1,9 @@
 require 'rails_helper'
-require 'rake'
 
 describe 'Communities Rake' do
 
   describe '#associate_community' do
 
-    before do
-      Rake.application.rake_require "tasks/communities"
-      Rake::Task.define_task(:environment)
-    end
-
     let :run_rake_task do
       Rake::Task['communities:associate_community'].reenable
       Rake.application.invoke_task 'communities:associate_community'

spec/lib/tasks/dev_seed_spec.rb

@@ -1,7 +1,4 @@
-require 'rake'
 require 'rails_helper'
-Rake::Task.define_task(:environment)
-Rake.application.rake_require('tasks/db')
 
 describe 'rake db:dev_seed' do
   let :run_rake_task do

spec/lib/tasks/globalize_spec.rb

@@ -1,15 +1,9 @@
 require "rails_helper"
-require "rake"
 
 describe "Globalize tasks" do
 
   describe "#migrate_data" do
 
-    before do
-      Rake.application.rake_require "tasks/globalize"
-      Rake::Task.define_task(:environment)
-    end
-
     let :run_rake_task do
       Rake::Task["globalize:migrate_data"].reenable
       Rake.application.invoke_task "globalize:migrate_data"

spec/lib/tasks/map_location_spec.rb

@@ -1,6 +1,4 @@
-require 'rake'
 require 'rails_helper'
-Rails.application.load_tasks
 
 describe 'rake map_locations:destroy' do
   before do

spec/lib/tasks/milestones_spec.rb

@@ -1,12 +1,6 @@
 require "rails_helper"
-require "rake"
 
 describe "Milestones tasks" do
-  before do
-    Rake.application.rake_require "tasks/migrate_milestones_and_statuses"
-    Rake::Task.define_task(:environment)
-  end
-
   describe "#migrate" do
     let :run_rake_task do
       Rake::Task["milestones:migrate"].reenable

spec/lib/tasks/settings_spec.rb

@@ -1,15 +1,9 @@
 require 'rails_helper'
-require 'rake'
 
 describe 'Settings Rake' do
 
   describe '#per_page_code_migration' do
 
-    before do
-      Rake.application.rake_require "tasks/settings"
-      Rake::Task.define_task(:environment)
-    end
-
     let :run_rake_task do
       Rake::Task['settings:per_page_code_migration'].reenable
       Rake.application.invoke_task 'settings:per_page_code_migration'

spec/lib/tasks/sitemap_spec.rb

@@ -1,7 +1,4 @@
-require 'rake'
 require 'rails_helper'
-Rails.application.load_tasks
-Rake::Task.define_task(:environment)
 
 feature 'rake sitemap:create' do
   before do

spec/rails_helper.rb

@@ -12,6 +12,7 @@ require 'capybara/rails'
 require 'capybara/rspec'
 require 'selenium/webdriver'
 
+Rails.application.load_tasks
 I18n.default_locale = :en
 
 include Warden::Test::Helpers