Make first() return proxy

This was returning the model itself, which does not match the
all()/find() APIs. This makes things more consistent.

Author: Lee Richmond

dist/jsorm.js

@@ -64,7 +64,7 @@ export default class Model {
     return this.scope().find(id);
   }
 
-  static first() : Promise<Model> {
+  static first() : Promise<RecordProxy<Model>> {
     return this.scope().first();
   }
 

dist/jsorm.js.map

@@ -35,10 +35,11 @@ export default class Scope {
     });
   }
 
-  // TODO: paginate 1
-  first() : Promise<Model> {
-    return this.per(1).all().then((models : CollectionProxy<Model>) => {
-      return models.data[0];
+  first() : Promise<RecordProxy<Model>> {
+    let newScope = this.per(1);
+    return newScope._fetch(newScope.model.url()).then((json : japiDoc) => {
+      json.data = json.data[0];
+      return new RecordProxy(json);
     });
   }
 

src/model.ts

@@ -70,7 +70,7 @@ describe('Model finders', function() {
     });
 
     it('returns a promise that resolves the correct instances', function() {
-      return expect(Person.first()).to.eventually
+      return expect(resultData(Person.first())).to.eventually
         .be.instanceof(Person)
         .have.property('id', '1')
     });