bcardarella/client_side_validations — pull request #465 by maintux (2013-01-22 17:02:01+00:00)
Title: remote validations

Add support to use remote validations when Rails application has been mounted on a custom path.

For example one of my applications has the config.ru like this
```
map '/useapp/accounting' do
require ::File.expand_path('../config/environment', __FILE__)
run Accounting::Application
end
```
In this case the standard remote validations does not work because the ajax call must be sent to '/useapp/accounting/validators/uniqueness' and not to '/validators/uniqueness'.

All tests are successfully passed. This change does not need other tests.