Update rspec syntax to v3

update rspec syntax to v3

change syntax to rspec v3

oops. fix typo

mailers classes with rspec3 syntax

helpers with rspec3 syntax

jobs with rspec3 syntax

serializers with rspec3 syntax

views with rspec3 syntax

support to rspec3 syntax

category spec with rspec3 syntax

spec/mailers/version_mailer_spec.rb

@@ -7,7 +7,7 @@ describe VersionMailer do
     before { SiteSetting.stubs(:contact_email).returns('') }
 
     it "doesn't send the email" do
-      subject.to.should be_blank
+      expect(subject.to).to be_blank
     end
   end
 
@@ -15,10 +15,10 @@ describe VersionMailer do
     before { SiteSetting.stubs(:contact_email).returns('me@example.com') }
 
     it "works" do
-      subject.to.should == ['me@example.com']
-      subject.subject.should be_present
-      subject.from.should == [SiteSetting.notification_email]
-      subject.body.should be_present
+      expect(subject.to).to eq(['me@example.com'])
+      expect(subject.subject).to be_present
+      expect(subject.from).to eq([SiteSetting.notification_email])
+      expect(subject.body).to be_present
     end
 
   end