Add .npmignore and update package.json to include npm prepublish so that hopefully I don't ruin everyone's builds when I update npm.

Author: radiolips

.npmignore

@@ -0,0 +1,15 @@
+node_modules
+bower_components
+coverage
+*.log
+spec
+freelancer
+.jscsrc
+.gitignore
+README.md
+PULL_REQUEST_TEMPLATE.md
+ISSUE_TEMPLATE.md
+protractor.conf.js
+.travis.yml
+Gruntfile.js
+karma.conf.js

package.json

@@ -11,7 +11,8 @@
     "build": "grunt && doctoc ./README.md && doctoc ./doc/README.md && doctoc ./doc/CHANGES.md",
     "test": "grunt lint && karma start karma.conf.js",
     "lint": "grunt lint",
-    "reset": "rm -rf dist node_modules"
+    "reset": "rm -rf dist node_modules",
+    "prepublishOnly": "npm build"
   },
   "keywords": [
     "gridstack",