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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.

This checks a little bit the installation and some
basic commands.

You can run it like that:

$ cd test
$ ./t0010-basic-commands.sh
 ok 1 - current dir is writable
 ok 2 - ipfs version succeeds
 ok 3 - ipfs version output looks good
 ok 4 - ipfs help succeeds
 ok 5 - ipfs help output looks good
 # passed all 5 test(s)
 1..5