license header and copyright in all files #25

Java

* This file is part of MountainNavigation.
* 
* MountainNavigation is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* 
* MountainNavigation is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
* 
* You should have received a copy of the GNU General Public License
* along with MountainNavigation.  If not, see <http://www.gnu.org/licenses/>.
* 
* @copyright Copyright (c) 2016 Vinzenz Rosenkanz <vinzenz.rosenkranz@gmail.com>
* 
* @author Vinzenz Rosenkranz <vinzenz.rosenkranz@gmail.com>

XML

<!--
    * This file is part of MountainNavigation.
    * 
    * MountainNavigation is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    * 
    * MountainNavigation is distributed in the hope that it will be useful,
    * but WITHOUT ANY WARRANTY; without even the implied warranty of
    * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    * GNU General Public License for more details.
    * 
    * You should have received a copy of the GNU General Public License
    * along with MountainNavigation. If not, see <http://www.gnu.org/licenses/>.
    * 
    * Copyright (c) 2016 Vinzenz Rosenkanz <vinzenz.rosenkranz@gmail.com>
    * 
    * Vinzenz Rosenkranz <vinzenz.rosenkranz@gmail.com>
-->

What about layout and values xml files?

Should be at the beginning of java files, not after imports.

Should be done for now, double check before release.