Updated .gitignore
WIP: Use mbostock bubble chart as source code to create a flattened hierarchy of bubbles. No console errors, but circles are invisible.

Svg now renders in DOM; had to change JSON data names in sample JSONdata for x,y,r to get non-NaN assignments in classes function.
Bubble chart now working. Places 'className' in center of circle as node text. Bubbles have color based on rgba value, opacity dependent on score. Radius based on followers ('size' attribute)

 - Added score in classes function
 - Changed radius function to use d.r as parameter instead of d.size -- this gave bubbles the corrext radius
 - Added .sort by value to pack layout
Add event handlers to node: on mouseover, mouseout, and click. Replace old d.{name} attributes with names as given in classes function.

 - d.value represents followers
 - d.className is screen_name
 - d.score is d.score

WIP: color, text color, var names
Move in-file sample json data to flask /testing route. Passes json object to createVisualization, and data renders.

 - Assign parameter 'scores' to 'root' variable for use in classes function and data binding
Rewrite friend_scores in the correct data format, as a dictionary wit
h a key of "children" - empty list to which friend scores are appende
d.

 - Instead of "name": "friends" as the root, replace with "name": user.USER_ID to nest all friends more semantically.
 - Append to empty list inside "children" using the attribute names from d3 - name, size, score.
 - Added output from my username to /testing route.