@wavesenterprise/elliptic v0.0.4

This is a shortened version of elliptic package (https://www.npmjs.com/package/elliptic)
Exporting single function createCurve that creates an instance of secp256k1 curve (such as new EC('secp256k1')) Only 3 methods left:

• curve.genKeyPair()
• curve.keyFromPublic()
• curve.keyFromPrivate()

Added subtract method for BasePoint