Modify class attr names, run timeline scoring functions on __init__

 - Change names of User class attributes to USER_ID and SCORE for clarity and simpliticity
 - Run timeline scoring functions on init only if USER_ID has length greater than 1 (will not run if user id not provided)
 - User's timeline given a score between 0 and 1, as score() function inits a Score object in simplescore module and returns value to object attr SCORE
Rewrite simplescore module as a class, Score, that runs scoring functions on init.

Init Score from friends.py, score = simplescore.Score().
Final score is attribute of Score class
Rewrote as class so that I could run all functions when creating a single score simply by init
Also because Score will be called for every user and user friend
Sample json route in Flask app for conveying friend and score to user interface
Sample template for passing json between flask and front end