remove no longer needed packages

package.json

@@ -19,9 +19,6 @@
     "csjs-inject": "^1.0.1",
     "csslint": "^1.0.2",
     "deep-equal": "^1.0.1",
-    "ethereumjs-abi": "https://github.com/ethereumjs/ethereumjs-abi",
-    "ethereumjs-block": "^1.6.0",
-    "ethereumjs-tx": "^1.3.3",
     "ethereumjs-util": "^5.1.2",
     "execr": "^1.0.1",
     "exorcist": "^0.4.0",