Add missing alt attr to non-decorative images

These are non visual-only or not decorative-only hence
context information added to alts

Thanks!

views/account/profile.pug

@@ -37,7 +37,7 @@ block content
     .form-group
       label.col-sm-3.control-label Gravatar
       .col-sm-4
-        img(src=user.gravatar(), class='profile', width='100', height='100')
+        img(src=user.gravatar(), class='profile', width='100', height='100', alt=((user.profile.name || user.email || user.id)))
     .form-group
       .col-sm-offset-3.col-sm-4
         button.btn.btn.btn-primary(type='submit')

views/api/facebook.pug

@@ -19,7 +19,7 @@ block content
   h3
     i.fa.fa-user
     |  My Profile
-  img.thumbnail(src=`https://graph.facebook.com/${profile.id}/picture?type=large`, width='90', height='90')
+  img.thumbnail(src=`https://graph.facebook.com/${profile.id}/picture?type=large`, width='90', height='90', alt=(profile.name || profile.username))
   h4= profile.name
   h6 First Name: #{profile.first_name}
   h6 Last Name: #{profile.last_name}

views/api/index.pug

@@ -9,5 +9,5 @@ block content
       a(href='/api/facebook', style='color: #fff')
         .panel.panel-default(style='background-color: #3b5998')
           .panel-body
-            img(src='http://i.imgur.com/jiztYCH.png', height=40)
+            img(src='http://i.imgur.com/jiztYCH.png', height=40, alt='Facebook')
             |  Facebook

views/partials/header.pug

@@ -27,9 +27,9 @@
           li.dropdown(class=(title == 'Account Management') ? 'active' : undefined)
             a.dropdown-toggle(href='#', data-toggle='dropdown')
               if user.profile.picture
-                img(src=user.profile.picture)
+                img(src=user.profile.picture, alt=(user.profile.name || user.email || user.id))
               else
-                img(src=user.gravatar(60))
+                img(src=user.gravatar(60), alt=(user.profile.name || user.email || user.id))
               span= user.profile.name || user.email || user.id
               i.caret
             ul.dropdown-menu