Added simple login function.
Handling opening multiple connections on the server side, assigning session IDs and receiving login data.
added mainPage draft
Added using ConnectionManager in index.html, removed Connect button.
Added registration on webpage
Added findUser method in UsersDatabase
Rudimentary user login enabled on the server.
Append list to parent element rather than to document.body
Added file initFunctions.js
Handle request for friendsData by the server
Fix: Assigning session ID after user login
Obtaining main user data after loading main screen.
Register
Merge
Registration on website
Fake chat
Change formatting in server.js

* add vim modeline (tabstop = 4, shoftwidth = 4, noexpandtab)
Loading the friends data, displaying the friend list in GUI.
Add displaying avatars in the friend list.
Update server.js - add registration feature

* add _registration_date to User class
* add methods documentation
* fix UsersDatabase constructor (now use synchronized version of
* fs.exists)