@jbenet @chriscool

(not to be merged into master) This is a hack to run sharness tests on
th ipfs2 binary. Instead of compiling cmd/ipfs, it compiles cmd/ipfs2
and copies this into test/bin/ipfs.

I thought this would be enough to pass the `basic-commands` test, but
it's not.

Although the output is fairly similar, the `ipfs version` test fails.

```
test (feat/test2) λ. diff version1 version2
1c1
< ipfs version 0.1.7
---
> ipfs version 0.1.5
```

I'm not very experienced with `sh` scripting, so perhaps I'm missing a
key ingredient or maybe misunderstanding the the tests are meant to
work.

Would like to get input on this.

Thanks, @maybebtc