Update Doge seeds, testnet parameters (#105)

Removed seeds which are no longer active, added testnet seed, and corrected testnet parameters from https://github.com/dogecoin/dogecoin/blob/master/src/chainparams.cpp.

Author: rnicoll

lib/coins/doge.js

@@ -12,10 +12,8 @@ var main = Object.assign({}, {
     magic: 0xc0c0c0c0
   },
   seedsDns: [
-    'seed.dogecoin.com',
     'seed.multidoge.org',
-    'seed2.multidoge.org',
-    'seed.doger.dogecoin.com'
+    'seed2.multidoge.org'
   ],
   versions: {
     bip32: {
@@ -31,6 +29,13 @@ var main = Object.assign({}, {
 
 var test = Object.assign({}, {
   hashGenesisBlock: 'bb0a78264637406b6360aad926284d544d7049f45189db5664f3c4d07350559e',
+  port: 44556,
+  protocol: {
+    magic: 0xfcc1b7dc
+  },
+  seedsDns: [
+    'testseed.jrn.me.uk'
+  ],
   versions: {
     bip44: 1,
     private: 0xf1,