feat: add npm support in main repository

- Add support for consuming the main repository via npm for releases

Closes #4739
Closes #5129

index.js

@@ -0,0 +1,3 @@
+require('./dist/ui-bootstrap-tpls');
+
+module.exports = 'ui.bootstrap';

package.json

@@ -10,6 +10,7 @@
   "files": [
     "dist/", "src/", "template/"
   ],
+  "main": "index.js",
   "scripts":{
     "test": "grunt"
   },