Change from manual URL construction to using a lib

Makes the code cleaner to read and more resilient to changes

Fixes https://jira.coreos.com/browse/QUAY-940

static/js/services/api-service.js

@@ -1,3 +1,5 @@
+var urlParseURL = require('url-parse');
+
 /**
  * Service which exposes the server-defined API as a nice set of helper methods and automatic
  * callbacks. Any method defined on the server is exposed here as an equivalent method. Also
@@ -44,7 +46,7 @@ angular.module('quay').factory('ApiService', ['Restangular', '$q', 'UtilService'
 
     // Build the path, adjusted with the inline parameters.
     var used = {};
-    var url = '';
+    var urlPath = '';
     for (var i = 0; i < path.length; ++i) {
       var c = path[i];
       if (c == '{') {
@@ -56,29 +58,29 @@ angular.module('quay').factory('ApiService', ['Restangular', '$q', 'UtilService'
         }
 
         used[varName] = true;
-        url += parameters[varName];
+        urlPath += encodeURI(parameters[varName]);
         i = end;
         continue;
       }
 
-      url += c;
+      urlPath += c;
     }
 
     // Append any query parameters.
-    var isFirst = true;
+    var url = new urlParseURL(urlPath, '/');
+    url.query = {};
+
     for (var paramName in parameters) {
       if (!parameters.hasOwnProperty(paramName)) { continue; }
       if (used[paramName]) { continue; }
 
       var value = parameters[paramName];
       if (value != null) {
-        url += isFirst ? '?' : '&';
-        url += paramName + '=' + encodeURIComponent(value)
-        isFirst = false;
+        url.query[paramName] = value
       }
     }
 
-    return url;
+    return url.toString();
   };
 
   var getGenericOperationName = function(userOperationName) {