transaction/ecdsa: remove unused imports

src/ecdsa.js

@@ -3,7 +3,6 @@ var crypto = require('./crypto')
 
 var BigInteger = require('bigi')
 var ECSignature = require('./ecsignature')
-var Point = require('ecurve').Point
 
 // https://tools.ietf.org/html/rfc6979#section-3.2
 function deterministicGenerateK(curve, hash, d) {

src/transaction.js

@@ -5,7 +5,6 @@ var opcodes = require('./opcodes')
 var scripts = require('./scripts')
 
 var Address = require('./address')
-var ECKey = require('./eckey')
 var ECSignature = require('./ecsignature')
 var Script = require('./script')