some beautifyings to login page

app/login/login.html

 <div ng-app="zaerp.login">
-    <div class="starter-template" ng-controller="LoginCtrl">
+    <div class="col-md-6" ng-controller="LoginCtrl">
         <h1>Zaerp Login Form</h1>
         <form name="loginForm" sf-schema="schema" sf-form="form" sf-model="model" ng-submit="onSubmit(loginForm)"></form>
     </div>