Another try to make bower install from github works

Author: sunshineo

bower.json

@@ -8,7 +8,7 @@
     "type": "git",
     "url": "git@github.com:sunshineo/angular-deckgrid.git"
   },
-  "main": "./angular-deckgrid.js",
+  "main": ["./angular-deckgrid.js"],
   "ignore": [
     "**/.*",
     "node_modules",