fix some rspec deprecations

spec/components/post_revisor_spec.rb

@@ -51,9 +51,9 @@ describe PostRevisor do
     it 'allows the user to change it to a wiki' do
       pc = PostCreator.new(newuser, topic_id: topic.id, raw: 'this is a post that will become a wiki')
       post = pc.create
-      post.revise(post.user, wiki: true).should == true
+      post.revise(post.user, wiki: true).should be_truthy
       post.reload
-      post.wiki.should be_true
+      post.wiki.should be_truthy
     end
   end
 

spec/controllers/users_controller_spec.rb

@@ -672,7 +672,7 @@ describe UsersController do
         user.reload.username.should == new_username
       end
 
-      pending 'should fail if the user is old', 'ensure_can_edit_username! is not throwing' do
+      skip 'should fail if the user is old', 'ensure_can_edit_username! is not throwing' do
         # Older than the change period and >1 post
         user.created_at = Time.now - (SiteSetting.username_change_period + 1).days
         user.stubs(:post_count).returns(200)