LxFind PPA and Backends

[Stephen Smally]

Hi Guys, i'm working a little on LxFind, here the news:
* The PPA is ready (is package into the lubuntu ppa so you should only 
update and install it)
* I added the backends for locate and find and polished a little the 
interface (these changes are building)

The Native GLib backend was a bit slow, but the find backend is quite 
fast (is setted by default). sadly locate doesn't admit a base directory 
(i think so), so the locate backend search filesystem-widely.

Hope this little utility can help ;-)

Regards

Stephen Smally