[DomCrawler] added support for query string with slash

Link\getUri() failed to return correct uri when current query string contains slash
Merge branch '2.1' into 2.2

* 2.1:
  updated VERSION for 2.0.23
  update CONTRIBUTORS for 2.0.23
  updated CHANGELOG for 2.0.23
  [Form] fixed failing test
  [DomCrawler] added support for query string with slash