[02-if]: solution on c added
[04-loops]: Oleg Pestov solution of 09 problem fixed (leap years)
[04-loops]: fix tests of 09 (take leap years into account)
[06-arrays-1d]: 03 (inversions) fixed
Merge branch 'master' of https://github.com/opestov/prog-base
Merge pull request #1 from a-timofeev/tests-fix

Tests fix