Adding Settings submenu, optimizing menu/submenu jQuery plugin

Within this pull request you will find:

1.  The settings subnav menu now works, displaying page options and translation links

2.  I've cleaned up lots of CSS and JS

3.  I've corrected a display: inline-block issue whereby whitespace no longer effects layout.

To test, clear your cache and check out the:

1.  Main menu and submenus

2.  Article page and settings menu

If all looks good, this PR is good.