Simplify menu partial, remove "settings", make it easier to override default paritial

[that0n3guy]

This simplifies things a little bit, but is NOT backwords compatable (but thats good). It makes it so that the user can use whatever format they want for displaying the menu. They can override the default menu partial two different "october" ways. Those 2 ways are listed in the default.htm file:

{#
 #### Options for overriding this file####
 # Option 1:
 # Add this DIRECTLY into your page/layout/paritial, change the __SELF__ below (note: NOT the _self)to your
 #    component alias  (eg. menu.menuTree)
 #
 # See the end of this screencast for more and example: http://octobercms.com/blog/post/mastering-components)
 #
 # Option 2:
 # If your overriding this partial using a paritial in your theme, leave the __SELF__ alone
 # See: https://github.com/octobercms/docs/issues/18)
 #}

This makes the "settings" pointless now.

[that0n3guy]

I just fixed the issue w/ disabled menu items showing.