POSIX shell `t/sizes`.

Replace `t/size` with one that will work with a POSIX shell.
Update Proof, revert Uglify JS, POSIX `t/test`.

Updated `package.json` to use Proof 0.0.17, and the 1.3 version of
Uglify JS. The 2.0 version of Uglify JS does not compress as well as 1.3
and it sends blank lines to standard out mussing up the report from
`t/sizes`.

Replace `t/test` with one that works with the POSIX shell.