Fixes roundHashes not resetting

Fix for #72
Issue is that the system may have a loaded chunk of shares to work on at the time of the block find, causing the cashed values to load instead.

Prep work for adding more coins.  Moving the multi-hashing AES-NI lib + the CN-Utils lib to optional requirements.

package.json

@@ -20,13 +20,11 @@
     "concat-stream": "^1.6.0",
     "cors": "^2.8.1",
     "crypto": "0.0.3",
-    "cryptonote-util": "git://github.com/Snipa22/node-cryptonote-util.git#xmr-Nan-2.0",
     "debug": "2.5.1",
     "express": "4.14.0",
     "jsonwebtoken": "^7.2.1",
     "minimist": "1.2.0",
     "moment": "2.17.1",
-    "multi-hashing": "git+https://github.com/Snipa22/node-multi-hashing-aesni.git",
     "mysql": "2.12.0",
     "node-lmdb": "0.4.12",
     "promise-mysql": "3.0.0",
@@ -42,5 +40,9 @@
     "uuid": "3.0.1",
     "wallet-address-validator": "0.1.0",
     "zmq": "^2.15.3"
+  },
+  "optionalDependencies": {
+    "cryptonote-util": "git://github.com/Snipa22/node-cryptonote-util.git#xmr-Nan-2.0",
+    "multi-hashing": "git+https://github.com/Snipa22/node-multi-hashing-aesni.git"
   }
 }