Update test/README.md about sharness directory

Now sharness is in "lib/sharness"

Add test script for block command

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

Add more documentation to ipfs

Update random for test/

There is a dummy test import: test/lib/random-dep.go
Because godep doen't yet vendor binaries nicely.

I moved installed things into own dirs bin and lib.

@chriscool sorry to move things around again, the top level
test dir was getting a bit clutterd.

prevent NAT check if given nil multiaddr

Install sharness