npm scripts - simplify and speed up dist builds

package.json

@@ -10,8 +10,7 @@
     "mock": "beefy development/mock-dev.js:bundle.js --live --open --index=./development/index.html --cwd ./",
     "watch": "mocha watch --recursive \"test/unit/**/*.js\"",
     "mascara": "gulp build && cross-env METAMASK_DEBUG=true node ./mascara/example/server",
-    "dist": "npm run dist:clear && npm install && gulp dist",
-    "dist:clear": "rm -rf node_modules/eth-contract-metadata && rm -rf node_modules/eth-phishing-detect",
+    "dist": "gulp dist",
     "test": "npm run test:unit && npm run test:integration && npm run lint",
     "test:unit": "cross-env METAMASK_ENV=test mocha --exit --require babel-core/register --require test/helper.js --recursive \"test/unit/**/*.js\"",
     "test:single": "cross-env METAMASK_ENV=test mocha --require test/helper.js",