Build system for unit tests added
Test for an empty vector added
Test for size() member function of an empty vector
Test for one push_back() added
Test for push_back() member function added
vector::back() member function added
vector::front() member function added
Better tests for vector::push_back() member function
vector::pop_back() member function added
vector::begin() and vector::end() member functions added
vector::cbegin() and vector::cend() member functions added
More detailed tests
Merge branch 'feature/vector' into develop