readd hadoop stream de/comp classes

[martindurant]

Fixes #137 , #140

This is a very simple implementation of "hadoop" format, but ought to work. I have not replicated the previous "guessing" technique, as there is actually no way to tell if a stream is hadoop or not, except to try to decompress it.

cc jfNasciment0, dbarrundia-tiger

[martindurant]

Any testers here?

[dbarrundia-tiger]

@martindurant thanks so much for this one. would it be possible to add this to 0.7.2 tag release?

[martindurant]

I was hoping someone would try #144 , but I suppose there's no reason not to release without that.

[dbarrundia-tiger]

@martindurant tested works great! thanks so much!