[RPG-7] Added skeleton of leveling up character and adding experience.
[RPG-7] Small fix.
add login page
add check if user is logged in
add battle, monster and person objects

battle simple engine
add battle simple engine and console log
new test_battle file
[RPG-7] Changed structure, added levelDown function.
Merge branch 'master' into RPG-7
monster and person classes
change person class
[RPG-7] Added exports, added test.
change port
Merge branch 'master' into login_view
Merge branch 'master' into battle_mode

Conflicts:
	app.js
change port
Merge branch 'master' into RPG-7
Fix monster check
bug in battle mode
Merge branch 'master' of https://github.com/Maciejfsafew/TWO_game