Merge pull request #1 from sidorovis/master

merge
2_4 done
solved 2_5
Added 2_6
fixed 2_6
fixed error
adding puzzles.doc for 5 week
Merge pull request #141 from vvysokikh/master

solved 2nd task by vvysokikh
Merge branch 'master' of github.com:sidorovis/cpp_craft_1013
fix vector_tests
Merge branch 'master' of https://github.com/sidorovis/cpp_craft_1013
start making 5

Signed-off-by: aLekSer <gdocse@gmail.com>
5_4 done with [false] hint

Signed-off-by: aLekSer <gdocse@gmail.com>
5_5 middle