Squashed commit of the following:

commit 949c36414d2200274e118864e6e247751f04d52f
Author: Carsten Ringe <carsten@kopis.de>
Date:   Fri Apr 18 08:55:05 2014 +0200

    Add "Share URL" if long-pressed on URL inside the article.

    I'm using this fairly often to add URLs from the article to my Instapaper to
    read the references later on. I think it's useful for others too.

commit d14b8233003aac4788cf581c2b7a7a0cb6603786
Author: Carsten Ringe <carsten@kopis.de>
Date:   Fri Apr 18 08:34:39 2014 +0200

    Replace all calls to e.printStackTrace() with Log.e(...).

commit 519a8933242842c9dfa3e457b67f4064266d76c4
Author: Carsten Ringe <carsten@kopis.de>
Date:   Sat Apr 12 11:17:34 2014 +0200

    Clean up preferences.

commit ab2c43389ecfaa11b09b4188b1ac0899bc51f678
Author: Carsten Ringe <carsten@kopis.de>
Date:   Sat Apr 12 11:01:27 2014 +0200

    Add preference to set domain.

    I am hosting my own installation of Goread, but the android app
    was using a hardcoded value for the domain. This is the first
    rough draft of a preference to set a different URL.

    One of the things I need to change is the login attempt right after
    the first start of the app - this is still using the default value
    for the domain "http://goread.io". I'm not quite sure yet how to
    change that and maybe show the domain preference first...