Date Created: 28/3/2018
Last modified: 9/4/2018
This task allows you to create members and follow one another
at non-existing social network.
Class Member's fields are his social ID, number of following and number of followers.
There are also two static variables: COUNTER_ID and ACTIVE_MEMBERS.
COUNTER_ID - gives a new member its social ID.
ACTIVE_MEMBERS - saves truck of all the existing members at current time.
clang++-5.0 -std=c++11 *.cpp
g++ -std=c++11 *.cpp