Parallel compression using pbzip2 or pigz

[tduboys]

Hi,
I'm always using BM on few servers and, some years ago, I've wrote a patch to use pbzip2 if installed, for a parallel compression process.

Unfortunately, I've lost my patch… but I can write it again and pull request it, but is this repo always managed by someone ? Or need I fork to another repo ?

I wanted to also write a new upload method using HubiC.

[kissifrot]

Sorry to dig this, but you can still create a PR, based on the devel branch :)

[alexislefebvre]

It looks like it was done in #111