Change Uniqueness validator message to follow ActiveRecord and other ORM behavior. Keeping the same message allows tools like Shoulda to work out of the box.

Signed-off-by: Marcos Tapajós <tapajos@gmail.com>

lib/couchrest/model/validations/locale/en.yml

@@ -1,5 +1,5 @@
 en:
   errors:
     messages:
-      taken: "is already taken"
+      taken: "has already been taken"
 

spec/couchrest/validations.rb

@@ -25,7 +25,7 @@ describe "Validations" do
     it "should not validate a non-unique document" do
       @obj = WithUniqueValidation.create(:title => 'title 1')
       @obj.should_not be_valid
-      @obj.errors[:title].should eql(['is already taken'])
+      @obj.errors[:title].should == ["has already been taken"]
     end
 
     it "should save already created document" do