Fix gradle build o365

For Office 365 we are adding the required dependencies through the built in template functionality, because we add gradle dependencies, and this modifies gradle.build and triggers a sync.

For Azure Services (Mobile Services and Notification Hubs), we don't have gradle dependencies yet (I believe it's on the roadmap), so we are manually adding the jars, without even modifying gradle.build. This is the reason why for Azure Services we need to manually trigger gradle sync.
In the future, if all the required dependencies are available as gradle dependencies, and can be added through the built in template functionality, we will be able to remove this code.