Default user image and cover

closes #812

- replace defaults with consistently named .png files
- change the settings saving code so that it doesn't double-save images and save the defaults to the db

ghost/admin/assets/sass/layouts/users.scss

@@ -104,7 +104,7 @@
         .user-last-seen {
             line-height: 1em;
         }
-        
+
     }
 
     .user-role {
@@ -128,7 +128,7 @@
 
     .user-profile-header {
         position: relative;
-        
+
         // Gradient overlay
         &:after {
             content: "";
@@ -208,7 +208,7 @@
             display: block;
             width: 100%;
             height: 100%;
-            background-image: url(/shared/img/default-user-profile-picture.jpg);
+            background-image: url(/shared/img/user-image.png);
             background-size: cover;
             background-position: center center;
         }
@@ -236,7 +236,7 @@
     #user-name {
         border-color: #fff;
     }
-    
+
     .user-details-bottom {
         padding: 0 40px;
         margin: -30px 0 0 0;

ghost/admin/tpl/settings/user-profile.hbs

@@ -9,7 +9,7 @@
 <section class="content no-padding">
 
     <header class="user-profile-header">
-        <img id="user-cover" class="cover-image" src="{{#if cover}}{{cover}}{{else}}/shared/img/cover.png{{/if}}" title="{{name}}'s Cover Image"/>
+        <img id="user-cover" class="cover-image" src="{{#if cover}}{{cover}}{{else}}/shared/img/user-cover.png{{/if}}" title="{{name}}'s Cover Image"/>
         <button class="edit-cover-image js-modal-cover">Change Cover</button>
     </header>
 

ghost/admin/views/settings.js

@@ -180,8 +180,6 @@
                 this.model.save({
                     title: title,
                     description: description,
-                    logo: this.$('#blog-logo').attr("src"),
-                    cover: this.$('#blog-cover').attr("src"),
                     email: email,
                     postsPerPage: postsPerPage,
                     activeTheme: this.$('#activeTheme').val()
@@ -320,9 +318,7 @@
                     'email':            userEmail,
                     'location':         userLocation,
                     'website':          userWebsite,
-                    'bio':              userBio,
-                    'image':            this.$('#user-image').attr('src'),
-                    'cover':            this.$('#user-cover').attr('src')
+                    'bio':              userBio
                 }, {
                     success: this.saveSuccess,
                     error: this.saveError