Place FormController instance on MainController

The use of ng-if creates a child scope, so the form directive creates
the FormController on this scope. $parent is used explicitly to ensure
the FormController is on the correct scope.

Fixes #4

app/css/angello.css

@@ -36,11 +36,11 @@ body {
     cursor: pointer;
 }
 
-input.ng-invalid {
+form.ng-dirty input.ng-invalid {
     border: 1px solid #B02B2C;
 }
 
-input.ng-valid {
+form.ng-dirty input.ng-valid {
     border: 1px solid #6BBA70;
 }
 
@@ -152,4 +152,4 @@ input.ng-valid {
     height: 100%;
     font-size: 14px;
     line-height: 1.2em;
-}
+}

app/partials/main.html

@@ -33,7 +33,7 @@ <h3>{{story.title}}</h3>
     <div ng-if="detailsVisible" class="my-fade-animation">
         <h3>Card Details</h3>
 
-        <form name="detailsForm" novalidate>
+        <form name="$parent.detailsForm" novalidate>
             <div class="control-group">
                 <div class="controls">
                     <label class="control-label" for="inputTitle">*Title</label>