Merge pull request #754 from owncloud/RadioListOnAccounts

Account list is now a radiobutton list

diff --cc src/com/owncloud/android/ui/activity/Preferences.java
index f794cf1,00544e8..04a4c7a
--- 1/src/com/owncloud/android/ui/activity/Preferences.java
--- 2/src/com/owncloud/android/ui/activity/Preferences.java
+++ b/src/com/owncloud/android/ui/activity/Preferences.java
@@@ -50,10 -50,9 +50,10 @@@ import com.owncloud.android.MainApp
  import com.owncloud.android.R;
  import com.owncloud.android.authentication.AccountUtils;
  import com.owncloud.android.authentication.AuthenticatorActivity;
 +import com.owncloud.android.datamodel.OCFile;
  import com.owncloud.android.db.DbHandler;
  import com.owncloud.android.lib.common.utils.Log_OC;
- import com.owncloud.android.ui.LongClickableCheckBoxPreference;
+ import com.owncloud.android.ui.RadioButtonPreference;
  import com.owncloud.android.utils.DisplayUtils;