Merge pull request #150 from bcbcarl/bugfix-149

Fix Issue #149
Readme for Pull #150 Issue #150
Resolves Issue #151 silly assert issue
Test for Issue #151
Added locale german, lots of translations
More translations, fixed existing ones
Translated two more levels
More levels translated
Translated interactive rebase level
More translated levels
More levels translated, only 9 more to go
More translations; five to go
Finished translating levels
Lots of minor translation errors fixed
Merge pull request #152 from nem75/translation

LearnGitbranching Translation German
BIG Update -- Moving to Grunt >0.4
Pull Request #152 Issue #152 credit for german translation
readme update
Error in git clone behavior Pull Request #152
gruntfile update