Check all vendored code so far is appropriately licensed

[jbenet]

Make sure all libs vendored are appropriately licensed (MIT, BSD, APL2.0).

[rht]

Using https://www.npmjs.com/package/node-license-validator

$ node-license-validator -l .
Identified licenses: [Apache, BSD, ISC, MIT, MPL]

[rht]

The package uses https://www.npmjs.com/package/spdx for its license algebra, but it isn't able to detect files without explicit license type, e.g. https://github.com/ipfs/go-ipfs/blob/master/Godeps/_workspace/src/github.com/kr/binarydist/License (MIT).

[jbenet]

maybe we should add a test that fails if anything outside of the permissive licenses gets added.

[jbenet]

though would not be good to have to depend on node.js installed for running ipfs tests.

[rht]

There is an official go spdx library (one out of two, the other one being python, http://git.spdx.org/) that can be used.

In addition to the two, there are only node implementation (the one linked above) and haskell implementation.
cabal is in the process of adopting this (haskell/cabal#2547).

[whyrusleeping]

our s3 datastore code relies on lgpl code at the moment.

[whyrusleeping]

We've gone through and removed the s3 lib, everything else is good to go