Refactoring of articles and article_categories. articles are now a nested resource of supplier.

public/stylesheets/sass/main.sass

@@ -281,7 +281,7 @@ div.edit_form
   :position fixed
   :top 23%
   :left 10em
-  :width 50em
+  :width 55em
   :background #FBFBFB
   :padding 3em
   :padding-top 1em

public/stylesheets/sass/rails_messages.sass

@@ -33,24 +33,23 @@ h3.error
 
 #errorExplanation 
   :width 40em
-  :border 2px solid red
   :padding 7px
   :padding-bottom 12px
-  :margin-bottom 20px
-  :background-color #f0f0f0
-  h2 
+  :color = !main_red
+  h2
+    :color = !main_red
     :text-align left
     :font-weight bold
-    :padding 5px 5px 5px 15px
-    :font-size 12px
-    :margin -7px
-    :background-color = !main_red
-    :color #fff
+    :margin 0
+    :padding 5px 5px 5px 5px
+    :font-size 15px
   p 
-    :color #333
-    :margin-bottom 0
+    :margin 0
     :padding 5px
-  ul li 
+  ul, li
+    :margin 0
+  li
+    :padding 0
     :font-size 12px
     :list-style square