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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.

Addresses comments in: https://github.com/jbenet/go-ipfs/commit/7e14f1737d146cb45f3d788f229dae9fd964e524

The tests were using the globally installed ipfs.
This commit changes it to build + use its own ipfs binary.

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