Android port

Fixes #18.
Depends on [Readers/56](https://github.com/EasyRPG/Readers/pull/56)

To compile it yourself see my 
[forum post](https://easy-rpg.org/forums/viewtopic.php?f=4&t=160#p946)

If you are too lazy to setup the build system:
[precompiled file](https://easy-rpg.org/downloads/player/EasyRpgPlayerActivity.apk)

System requirements:
Android Api10 (2.3.3 and newer)
OpenGL ES2
CPU with hardware floating point (armeabi-v7a)
The fastest CPU you can get ;)

Emulator image (emulator interface cropped):

![unbenannt](https://f.cloud.github.com/assets/1331889/1803886/932f78a4-6c2e-11e3-96fa-7c16034c818d.png)

Tester checklist:
- No SD card -> No Sd Card message displayed
- No easyrpg folder on Sd card -> created on startup
- No games in easyrpg/games -> No games found displayed
- RTP is detected after placing it in [sd-card]/easyrpg/rtp/2000 (and 2003 folder)
- Midi works after extracting http://www.libsdl.org/projects/SDL_mixer/timidity/timidity.tar.gz into /easyrpg
- Doing a long-left-click on a game displays a "Select region" dialog.
- Switching the region works (try Yume Nikki e.g. with Western Europe (Error) and Japanese (Works))
- Start the game (should work as "good" as under Windows/Linux/Mac)
- Press the menu (hardware) button -> Menu with 3 options (Toggle Fps, Toggle Ui, End Game) appears, the 3 buttons work
- Press the back (hardware) button -> End Game msgbox appears
- Cross and the two circles (A and B) onscreen buttons work.