BIP32/secp256k1/keyPair preparation #915
                
     Merged
            
            
          
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As we move towards moving
HDNodetobip32, and supportingsecp256k1, I'm putting this PR up so we can move forward on those API's by liberating the type signature ofTransactionBuilder.prototype.signa little bit.This would simultaneously allow
HDKeyto inter-operate withTransactionBuilder, supportingsecp256k1signing operations near-immediately for those who use that module.And soon-thereafter for our own new
HDNodemodule.toRSBufferandfromRSBufferare conceptually part of #459, for the4.0.0API.That is, with
ECSignatureremoved in4.0.0, we will only interop on "RSBuffer"s, a-kin tosecp256k1, and only need to transcode to a script signature when encoding theTransactionitself.For now, requesting feedback,TODO
AddTransactionBuilder.prototype.signtests for new functionality