Julia version using BLAS gemm

This runs in 1.8 seconds on a Xeon E5410 running RHEL5.

Compare to a roughly 4x slower Julia version that does not use BLAS here
https://gist.github.com/anonymous/c7501c8bbf4ac7ba8a20

Unfortunately I can't get a new enough OCaml or F# on this distribution for a direct comparison, at least not easily. Rust doesn't have binaries for RHEL5 to compare to this version https://news.ycombinator.com/item?id=7872398, and [the C++ example from the comments](http://pastebin.com/5pMka6ZJ) fails to compile even with GCC 4.8.0 due to the old version of Boost in `/usr/include/boost`. I should get a newer machine and/or better distribution.