mode menu: remove approve option.

Remove the approve option from the post mode menu. Mass approving posts
is rarely needed. The javascript was also buggy (it didn't update the
data attributes correctly when undeleting a post).

The replacement for this feature is to use a tagscript with the
status:active tag.

app/javascript/src/javascripts/posts.js.erb

@@ -521,23 +521,6 @@ Post.update = function(post_id, params) {
   });
 }
 
-Post.approve = function(post_id) {
-  $.post(
-    "/post_approvals.json",
-    {"post_id": post_id}
-  ).fail(function(data) {
-    var message = $.map(data.responseJSON.errors, function(msg, attr) { return msg; }).join("; ");
-    Utility.error("Error: " + message);
-  }).done(function(data) {
-    var $post = $("#post_" + post_id);
-    if ($post.length) {
-      $post.data("flags", $post.data("flags").replace(/pending/, ""));
-      $post.removeClass("post-status-pending");
-      Utility.notice("Approved post #" + post_id);
-    }
-  });
-}
-
 Post.initialize_saved_searches = function() {
   $("#save-search-dialog").dialog({
     width: 700,