Even with passing a bundle with the layout ID sometimes
some users will encounter a situation where the _layout
variable is null. To avoid further issues, creating a
class for each intro slide, so the layout is encoded
into the class itself.
This is necessary, as Robolectric 3.0 did not work
with the newer Android SDK. Further, Robolectric 3.3.2
did not like running tests at SDK 17, so this was
also bumped.
This about page layout is borrowed from K-9 Mail:
https://github.com/k9mail
Italian translations provided by Airon90.
Dutch translations provided by PanderMusubi.
