Use sha.js instead of crypto for hash calculation

[nochkin]

Initial discussion @ #5249

[pleerock]

Thanks guys!

[thynson]

Why not use isomorphic-crypto instead, which still use native SHA implementation on node environment.

[nochkin]

@thynson,
That will probably break using TypeORM in React-Native (this is how I stumbled onto this issue initially).
At least, the "sha.js" is more universal solution as it's available in other worlds too.