wallet: Move dust and fee per kb into networks.js

src/networks.js

@@ -9,7 +9,9 @@ module.exports = {
     },
     pubKeyHash: 0x00,
     scriptHash: 0x05,
-    wif: 0x80
+    wif: 0x80,
+    dustThreshold: 5430, //should be 546 https://github.com/bitcoin/bitcoin/pull/2760/files
+    feePerKb: 20000
   },
   dogecoin: {
     magicPrefix: '\x19Dogecoin Signed Message:\n',
@@ -19,7 +21,9 @@ module.exports = {
     },
     pubKeyHash: 0x1e,
     scriptHash: 0x16,
-    wif: 0x9e
+    wif: 0x9e,
+    dustThreshold: 1000000,
+    feePerKb: 100000000
   },
   litecoin: {
     magicPrefix: '\x19Litecoin Signed Message:\n',
@@ -29,7 +33,9 @@ module.exports = {
     },
     pubKeyHash: 0x30,
     scriptHash: 0x05,
-    wif: 0xb0
+    wif: 0xb0,
+    dustThreshold: 1000,
+    feePerKb: 100000
   },
   testnet: {
     magicPrefix: '\x18Bitcoin Signed Message:\n',
@@ -39,6 +45,8 @@ module.exports = {
     },
     pubKeyHash: 0x6f,
     scriptHash: 0xc4,
-    wif: 0xef
+    wif: 0xef,
+    dustThreshold: 5430,
+    feePerKb: 20000
   }
 }

src/wallet.js

@@ -20,9 +20,6 @@ function Wallet(seed, network) {
   this.addresses = []
   this.changeAddresses = []
 
-  // Dust value
-  this.dustThreshold = 5430
-
   // Transaction output data
   this.outputs = {}
 
@@ -182,7 +179,7 @@ function Wallet(seed, network) {
   }
 
   this.createTx = function(to, value, fixedFee, changeAddress) {
-    assert(value > this.dustThreshold, value + ' must be above dust threshold (' + this.dustThreshold + ' Satoshis)')
+    assert(value > network.dustThreshold, value + ' must be above dust threshold (' + network.dustThreshold + ' Satoshis)')
 
     var utxos = getCandidateOutputs(value)
     var accum = 0
@@ -206,7 +203,7 @@ function Wallet(seed, network) {
       if (accum >= subTotal) {
         var change = accum - subTotal
 
-        if (change > this.dustThreshold) {
+        if (change > network.dustThreshold) {
           tx.addOutput(changeAddress || getChangeAddress(), change)
         }
 
@@ -235,13 +232,12 @@ function Wallet(seed, network) {
     return sortByValueDesc
   }
 
-  var feePerKb = 20000
   function estimateFeePadChangeOutput(tx) {
     var tmpTx = tx.clone()
     tmpTx.addOutput(getChangeAddress(), 0)
 
     var byteSize = tmpTx.toBuffer().length
-    return feePerKb * Math.ceil(byteSize / 1000)
+    return network.feePerKb * Math.ceil(byteSize / 1000)
   }
 
   function getChangeAddress() {