fix($http): add .send() alias for .retry() to get better stack trace on error

src/service/http.js

@@ -96,7 +96,7 @@ function $HttpProvider() {
 
   // the actual service
   function $http(config) {
-    return new XhrFuture().retry(config);
+    return new XhrFuture().send(config);
   }
 
   $http.pendingRequests = [];
@@ -347,6 +347,9 @@ function $HttpProvider() {
       return this;
     };
 
+    // just alias so that in stack trace we can see send() instead of retry()
+    this.send = this.retry;
+
     /**
      * Abort the request
      */