Added info logging and events around core scenarios in adal.js
Added info logging and events around core scenarios in adal.js

ryanflowers/azure-activedirectory-library-for-js,dmxfee/azure-activedirectory-library-for-js,dmxfee/azure-activedirectory-library-for-js,ryanflowers/azure-activedirectory-library-for-js