Homework 5 is done.
fixed 2 week
some more fixes to 2 week
fix small errors
Merge pull request #180 from microwolnovka/new_2_week

2 week fixed small errors
Refactored vector<T>::insert method. Added test for it. Added const to parameter passing to method increase_capacity. Added check for self assignment. Replaced const_cast to code duplication for const and non-const subscripting operators.
Merge pull request #172 from kurman-vladimir/homework5

Homework 5 is done.
Merge branch 'master' of https://github.com/marozau/cpp_craft_0314