Fixed signature for P05
Merge pull request #11 from akkomar/P05-signature

Thanks!
Merge pull request #12 from wregab/master

Huge THANKS!
Refresh the doc and add how to work with the project in IntelliJ IDEA
Merge branch 'master' of https://github.com/jaceklaskowski/scalania
Euler P01
merge z jlaskowski/master