Base58: MIT license.

According to http://cryptocoinjs.com/modules/misc/bs58/
as mentioned in
https://github.com/cryptocoinjs/bs58/issues/7#issuecomment-49555491
Merge pull request #21 from dchest/base58-license

Base58: MIT license.
Make namespace slightly less confusing
Merge branch 'master' into zoomable-minilock-id