Tutorials

I have been seeing null pointer errors on [row.getHeight()](https://github.com/jpeg729/XPrivacy/blob/tutorials/src/biz/bokhorst/xprivacy/ActivityMain.java#L832).

I am not sure how we should work around this problem.
We could calculate the height of a row in the list view. However, for the red numbers, I don't know what to do.

I am working on a version without red numbers and with a halo for the help button. I will make a separate pull request.