superfish 6.x-1.9-beta5

- #804616 Fixed speed value and validation bugs. (Comments 8th and 10th)
- #1107432 Added 'firstandlast' class for single menu items.
- #1138278 Fixed the array_remove_empty function bug. (Comment 5th)
- #1246378 Removed menu caching entirely.
- #1276040 Updated the superfish.drush.inc to use Github.
- #1347710 Fixed a bug in the Drupal Behaviors file. (Comment 13th)
- #1356064 Fixed block title bug.
- #1367086 Fixed the superfish_styles function bug (and related tweaks).
- #1455724 Tweaked the if statement.
- #1158926 Libraries API is no longer mandatory.
- #1539894 Added a new feature to make it possible to hide link descriptions.
- #1700566 Block form tweaked.
- Added parts of the hook_requirements which were left behind from earlier commit.
- #1570796 Added README.txt file.