Fix text color and text selection color of outgoing links

This will change the text color of outgoing links from blue
to gray to increase the contrast to the background color of the
outgoing message bubble. Also, the text selection color of these
links will be the same as for normal text.

stylesheets/_conversation.scss

@@ -239,12 +239,16 @@
       }
 
       .content {
-        &::selection {
+        a {
+          color: $grey_l;
+        }
+
+        &::selection, a::selection {
           color: $grey_d;
           background: white;
         }
 
-        &::-moz-selection {
+        &::-moz-selection, a::-moz-selection {
           color: $grey_d;
           background: white;
         }

stylesheets/manifest.css

@@ -669,12 +669,17 @@ input.search {
     .message-list .outgoing .bubble::after {
       right: -8px;
       border-left: 8px solid #2090ea; }
-    .message-detail .outgoing .bubble .content::selection,
-    .message-list .outgoing .bubble .content::selection {
+    .message-detail .outgoing .bubble .content a,
+    .message-list .outgoing .bubble .content a {
+      color: #f3f3f3; }
+    .message-detail .outgoing .bubble .content::selection, .message-detail .outgoing .bubble .content a::selection,
+    .message-list .outgoing .bubble .content::selection,
+    .message-list .outgoing .bubble .content a::selection {
       color: #454545;
       background: white; }
-    .message-detail .outgoing .bubble .content::-moz-selection,
-    .message-list .outgoing .bubble .content::-moz-selection {
+    .message-detail .outgoing .bubble .content::-moz-selection, .message-detail .outgoing .bubble .content a::-moz-selection,
+    .message-list .outgoing .bubble .content::-moz-selection,
+    .message-list .outgoing .bubble .content a::-moz-selection {
       color: #454545;
       background: white; }
   .message-detail .control .bubble .content,