[Owncloud] Need feedback for apptemplate_advanced and app tutorial

[Bernhard Posselt]

Hi,

I'd really appreciate it if people with framework and/or programming 
patterns knowledge could give me feedback on the current state of the 
apptemplate_advanced app. The app is already documented in a tutorial 
which needs review too 
(http://doc.owncloud.com/server/5.0/developer_manual/tutorial.html)

I want to make it as good as possible :)

PS: thanks DeepDiver for looking into the code :)