Add check for angular AND angular.module.
Add check for angular AND angular.module.

This should surely mean angular is correctly defined?

Should fix #123.

gsklee/ngStorage,lalithr95/ngStorage,egilkh/ngStorage,4talesa/ngStorage,JulienBier/ngStorage,GerryFudd/ngStorage,castle-it/ngStorage,bratishchev/ngStorage,prudvihemanth/ngStorage,imskojs/ngStorage,wodka/ngStorage,BaggersIO/ngStorage,kknirala/ngStorage,robinboehm/ngStorage,wyvern8/ngStorage