use rimraf and mkdirp instead of shell #125

package.json

@@ -11,7 +11,7 @@
     "fancy-dedupe": "0.1.0",
     "history": "1.17.0",
     "moment": "2.11.2",
-    "react": "0.14.7",
+    "react": "^0.14.7",
     "react-dom": "0.14.7",
     "react-json-inspector": "6.1.3",
     "react-redux": "4.1.2",
@@ -55,12 +55,14 @@
     "karma-webpack": "^1.7.0",
     "live-server": "^0.9.1",
     "minimist": "^1.2.0",
+    "mkdirp": "^0.5.1",
     "mocha": "^2.4.5",
     "node-sass": "^3.4.2",
     "npm-run-all": "^1.5.1",
     "react-addons-test-utils": "^0.14.7",
     "redux-mock-store": "0.0.6",
     "requirejs": "^2.1.22",
+    "rimraf": "^2.5.2",
     "sass-lint": "^1.5.0",
     "tippy-top-sites": "^0.1.0",
     "webpack": "^1.12.12",
@@ -130,7 +132,7 @@
   "repository": "mozilla/activity-streams",
   "scripts": {
     "once": "npm run bundle && npm run firefox",
-    "clean": "rm -rf data/content/* && mkdir -p data/content",
+    "clean": "rimraf data/content/* && mkdirp data/content",
     "changelog": "conventional-changelog -i CHANGELOG.md -s",
     "copyTestImages": "cpx \"node_modules/tippy-top-sites/images/**/*\" data/content/favicons/images",
     "bundle": "npm-run-all bundle:*",