remove postinstall command and move node-sass to dev-deps

Author: alexander-daniel

package.json

@@ -22,7 +22,6 @@
   ],
   "scripts": {
     "preprocess": "node tasks/preprocess.js",
-    "postinstall": "npm run preprocess",
     "bundle": "node tasks/bundle.js",
     "header": "node tasks/header.js",
     "build": "npm run preprocess && npm run bundle && npm run header",
@@ -70,7 +69,6 @@
     "ndarray-fill": "^1.0.1",
     "ndarray-homography": "^1.0.0",
     "ndarray-ops": "^1.2.2",
-    "node-sass": "^3.4.1",
     "right-now": "^1.0.0",
     "robust-orientation": "^1.1.3",
     "sane-topojson": "^1.2.0",
@@ -94,6 +92,7 @@
     "karma-coverage": "^0.5.3",
     "karma-firefox-launcher": "^0.1.6",
     "karma-jasmine": "^0.3.6",
+    "node-sass": "^3.4.1",
     "open": "0.0.5",
     "prepend-file": "^1.3.0",
     "prettysize": "0.0.3",