Package under directory named after the build

[Ryan Scott Lewis]

When extracting the package (built from make package), it's contents are dumped into pwd/output path but it would be nicer (and is conventional) to have a single entry within a package, named after the version.

This would change the manual install steps:

tar xf cutback-linux-x86_64-0.0.1-pre.tar.gz
cd cutback-0.0.1-pre # The new bit
make install