modern for loop
typo in variable name + add a getter for it
It's probably a good idea to not switch to the lesson until it's completely initialized
more informative error message
Basic testing infrastructure

This simply only that python entities manage to solve the Java worlds.

It could be extended in many way, including:
 - this shoud be converted to junit
 - this should share more code with usual mutation process to catch more issues

But at least, we have a testing infrastructure!
fix lessons/welcome/basics/BasicsEntity.py so that it passes our newly created test suite
Merge pull request #88 from fstengel/master

[UI] work on localization.
there is no need for an english translation; gettext fallbacks to english when no translation is provided
merge translation with po4a and 'ant i18n-generate', no manual change
build an english file since the fallback on mac is french... weird but anyway
port test to jUnit; share more code between test and regular use
put Bat-specific code in BatExercise, not in the generic test runner
document changes of this night
Don't run the demo in Java anymore

Now that we have a testsuite ensuring that the python entities are
able to build the same world than the java ones, that's useless.

That being said, the test suite is somehow far from being all green :)
fix an easily broken test
code factorization
Use Vector<World> instead of World[]

This will avoid endless conversions to List when the UI ask for the
worlds.
Move a pimple around so that all pimples are on the same nose
improve some french translations
also pair correctly the javascript exercise