Missing changes required to make new UI work (#2793)

* Getting rid of old dapps

* Updating proxypac and allowing home.parity on signer

* CORS support for API

* Fixing CORS - origin is sent with protocol

* Fixing signer with proxy

* Fixing grumbles

* Fix expect msg [ci:skip]

dapps/src/router/host_validation.rs

@@ -15,7 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 
-use DAPPS_DOMAIN;
+use apps::DAPPS_DOMAIN;
 use hyper::{server, header, StatusCode};
 use hyper::net::HttpStream;