Merge pull request #94 from fstengel/Test

Integrate the i18n work of Franck
four more exercises ported to python
https://www.youtube.com/watch?v=ARJ8cAGm6JE
world's diff were inversed. Incredible that nobody ever told us...
port the mission text to python, too
allow turmite's exercises to be done in python
port a first turmite exercise to python
Merge branch 'Test'
Merge pull request #95 from fstengel/master

Bundling a Mac .app
Don't bother me. If I close the window, that's on purpose
Well, actually, lightbot exercises are simple enough to not need one directory per exercise. Sorry for the noise (and the extra work)
move bat exercises on integer arrays into the welcome lesson (fix #21)
port array bat exercises to python, don't fail on empty arrays
cosmetics: use one-liner comments to easily comment blocks of exercises
port the bat array exercises to python (make their tests pass)
I didn't notice earlier that this test does not even compile
set a timeout onto tests to avoid issues
warnings are evil, fix them or ignore them
increase that timeout because turmite exercises are a bit long
document last changes