remove unneeded dependencies

package.json

@@ -21,10 +21,7 @@
     "babel-plugin-transform-es2015-block-scoping": "^6.15.0",
     "babel-plugin-transform-es2015-template-literals": "^6.8.0",
     "browserify": "^13.0.1",
-    "ethereumjs-block": "^1.3.1",
-    "ethereumjs-tx": "^1.1.3",
     "ethereumjs-util": "^4.5.0",
-    "ethereumjs-vm": "^2.0.2",
     "http-server": "^0.9.0",
     "nightwatch": "^0.9.5",
     "solc": "^0.4.3",