Bump to JGit 4.0.0

Luca Milanesio

2015-06-12 a1cee65c7242f69f7e35978d98cea391095d7225

 src/main/java/com/gitblit/manager/GitblitManager.java

@@ -662,6 +662,11 @@
   }

   @Override
   public UserModel authenticate(String username) {
      return authenticationManager.authenticate(username);
   }

   @Override
   public UserModel authenticate(HttpServletRequest httpRequest, boolean requiresCertificate) {
      UserModel user = authenticationManager.authenticate(httpRequest, requiresCertificate);
      if (user == null) {