Updted installer script to install libssl-dev. Updated requirements.txt
Introduced userQuit() method in this commit.
1. userQuit() logs the act of the user quitting the network.
2. Made changes to bot.py wherever the % formatting style was used. The format() function is the newer style.
Merge pull request #4 from VaticanCameos/log-quit

Adding logging functionality for user quit. Fixes #1