[Engine-libGDX] Fixed scrolling direction
[Client] Increment client version
[Client] Fixed possible map synchronization problem

The problem causes a NPE in case the map group is updated at the same time as the map is rendered
[Nifty-Controls] Added possibility to alter the counter of the crafting dialog
[Client] Improved handling of the selected crafting dialog amount
[Common] Fixed loading problems with the skills

The skill loader caused concurrent modification exceptions in case the different loading classes initialize the loading from different threads
[Engine-libGDX] Display a error in case of a initialization problem

In case its impossible to run the client on a certain system, show a error message that says so.
[Common] Use of the XML Pull Parser to load the skills
[Common] Added XPP to common build script
[Downloader] Added missing reference to the XPP library in the build script
[Client] Removed useless null check