Revert "added index"

This reverts commit b50a742409541f2cc52c591558126d888dbd2677.
Revert "added zad3 (map reduce)"

This reverts commit 8e44e8474cd5a7bfc51618a6a4001c0b783429b0.
Merge pull request #255 from mszygenda/master

Usunięcie zadania 3