Update AppCompactor

Hiyo, I noticed today when I downloaded AppCompactor it came with a old, unstable version of 7za (9.15)

As most of you know 7-Zip 9.20 (Stable) was released a few months ago.
I don't think it should cause any problems using the old version but, since a lot of PortableApps are compressed using it and PA 2.0 *should* be right around the corner, I would think this needs to be updated.

Its also using an old version of UPX (3.5) which would be nice to have updated to the latest (3.7)

7za 9.20 download:
http://sourceforge.net/projects/sevenzip/files/7-Zip/9.20/7za920.zip/dow...

UPX 3.7 download:
http://upx.sourceforge.net/#downloadupx

I know its not that important so, please don't flame.