clean codes for test

spec/1_fetch_access_token_spec.rb

 # NOTE: the rspec should be test alonely.
-require "spec_helper"
 describe WeixinAuthorize::Client do
   describe "#get access_token" do
     it "return a access_token nil value before authenticate" do

spec/api/custom_spec.rb

-require "spec_helper"
-
 describe WeixinAuthorize::Api::Custom do
   let(:text_message) do
     "text Custom message"

spec/api/groups_spec.rb

-require "spec_helper"
 describe WeixinAuthorize::Api::Groups do
 
   let(:group_name) do

spec/api/media_spec.rb

-require "spec_helper"
-
 describe WeixinAuthorize::Api::Media do
 
   let(:image_jpg_path) do

spec/api/menu_spec.rb

 # encoding: utf-8
-require "spec_helper"
-
 describe WeixinAuthorize::Api::Menu do
 
   it "can create a menu" do

spec/api/qrcode_spec.rb

-require "spec_helper"
-
 describe WeixinAuthorize::Api::Qrcode do
 
   it "#create_qr_scene" do

spec/api/user_spec.rb

-require "spec_helper"
-
 describe WeixinAuthorize::Api::User do
   it "can get a weixin User info" do
     user_info = $client.user(ENV["OPENID"])