Added sources of Lab2
Fixed compilation errors of C++98 compatibilty
Added stress test
Fixed copy constructor and code coverage
Fixed all tests and added new ones
Merge pull request #1 from VladVin/vinogradov-vlad-lab2-new

Fixed all tests and added new ones
Merge pull request #34 from VladVin/vinogradov-vlad-lab2

Виноградов - Лабораторная работа #2