make it possible to override the font icon class

This is a little bit ugly, but it makes multiple font icon mixins
override one another, which is helpful for things like custom dropdown
icons.

h/css/base.scss

@@ -197,7 +197,7 @@ $em: 14 / 1em !default;
   }
   @if $iconside == left {
     &:before {
-      content: $char + '\a0';
+      content: $char + '\a0' !important;
       font-family: 'icomoon';
       font-style: normal;
       margin-right: $offset;
@@ -205,20 +205,20 @@ $em: 14 / 1em !default;
       font-weight: normal;
     }
     &:after {
-      content: "";
+      content: "" !important;
     }
     &:empty {
       &:before {
-        content: $char;
+        content: $char !important;
       }
     }
   }
   @if $iconside == right {
     &:before {
-      content: "";
+      content: "" !important;
     }
     &:after {
-      content: '\a0' + $char;
+      content: '\a0' + $char !important;
       font-family: 'icomoon';
       font-style: normal;
       margin-left: $offset;
@@ -227,7 +227,7 @@ $em: 14 / 1em !default;
     }
     &:empty {
       &:after {
-        content: $char;
+        content: $char !important;
       }
     }
   }

h/css/common.scss

@@ -305,10 +305,6 @@ blockquote {
   @include fonticon("\002f", right, 0);
   cursor: pointer;
 
-  .open > & {
-    @include fonticon("\e007", right, 0);
-  }
-
   &:active {
     outline: 0;
   }