Build fixes

[gzsombor]

#365 : Fix the build, so it should work out of the box, without hand tuning, copying various files around. But instead of fixing the documentation, it is better to fix the actual code ( http://www.goldyliang.net/blog/how-to-build-fbreaderj-android/ )

[bibliotecaortodoxa-ro]

After file move to the same package, just delete the import org.fbreader.util.NaturalOrderComparator; . There is no need to add that line
import group.pals.android.lib.ui.filechooser.utils.NaturalOrderComparator;

[dbdean]

@geometer, is there anything preventing this from being pulled into the main repo? It would have certainly saved me a lot of time. Thanks!

[gzsombor]

It seems that this project is effectively dead. My other pull request, about adding a new menu item "Recently downloaded books" is still open since May of 2016. Do you have desire to work on FBReaderJ ?

[dbdean]

@gzsombor, I was hoping to change the way graphics were rendered in night mode, so that they didn't have a bright white background, but it does appear that at least the open source code here is pretty dead. However, fbreader seems to be continuing as an app, so I suspect @geometer might be continuing development as closed source, which seems to leave little point in contributing code, as it won't turn up in the play-store app anyway.