Merge branch 'master' of github.com:DjangoGirls/tutorial
wording, grammar, clarified explanations
Merge branch 'master' of github.com:DjangoGirls/tutorial
wording, grammar, clarified explanations (only halfway done, up to New content and complex changes)
Merge branch 'master' of github.com:DjangoGirls/tutorial
Merge pull request #51 from kerstin/master

wording, grammar, clarified a few things