ntopng 1.1.4 (new Formula)

Hi,

This is a new Formula for [ntopng](http://www.ntop.org/products/ntop/). 

Let me know if there is any problem.

Thanks,
Filippo

In order to install ntopng with this formula, i had to do some changes to makefile. So the sourceforge version is not compatible with homebrew and for commercial reason i can't upgrade it now.
I created a new tar that contains the stable version for homebrew. In less that a month we release a new stable version equal for all platform.

For the stable version i would like to use this 

 url 'https://svn.ntop.org/svn/ntop/tags/ntopng-1.1.4.tar.gz', :using =>   :curl
  sha1 "9e1297def6e103110741d08cc7f3d4f4f4bc5c7d"

and for the devel i would like to use the svn trunk repository.

What do you think of this solution?