Scaling d3 svg and contents to fit. Added margins, padding.

 - Use margins and padding to create outerWidth, innerWidth, w, h. W and h represent the width and height of the usable svg.
 - Use print statements to check CX and CY, which were giving NaN errors.
 - Use 1-d.score for cy positioning, since origin is in upper left.
Add class to div where svg will be appended to, using .large-12 columns. Append svg to div (#viz)
Modify margins and padding for svg width and height. Base transparency (rgba) value on d.score. Delete old test code.
Add include_rts = True to user_timeline request, getting retweets.
Add mouseover effects of orange fill, screen name text. On mouseout, returns to previous state.

 - Append text to svg
 - Position using x and y coordinates of "this", the current circle.
 - Set styles of text and circle in .on(mouseover)
 - Add id "tooltip" to text element, for quick removal on mouseout