Debugging: why app returned friends for my username despite other usernames entered. Changed get_friends_ids to accept screen name specifically.

 - WIP: if no friends, page simply stays blank. Must add handler.
Update view with rows and column size classes, to add a sidebar and error message div to the screen.

Add both .small and .large class sizes, which specify width depending on size of screen.
Add if/else statements to #viz button handler, for case in which no username is entered. AJAX only runs if length of username > 0.

WIP: need to handle other user entry cases.
Created unit test to check return value of get_friends_ids. Successfully get friends_ids based on screen name entered in main()
Add on-click function to circles. On click, joined data is formatted as list, and a for loop adds each piece of data to a list in #detail panel.

This will allow me to add data to the side panel on click.
Add ul to side panel. Move id to panel, rather than wrapper div, for more specific access to panel and ul.
Add .empty() to top of on-click function, to empty any existing li elements from the parent ul element.
Deleted out-of-date json route handler from flask
Deleted compass directory from static/ -- the config.rb file I need is already located inside static/politwit, the Foundation project directory.
Refactor AJAX calls into 2 separate modules, imported in HTML body: app.js, which contains event handlers, and ajax.js, which contains ajax calls library.
Add route to flask to handle requests for tweets made by clicking on d3 objects.
Add ajax.js and app.js to contain ajax library (for various ajax calls) and event handlers.

app.js contains event handlers for clicks.
ajax.js contains generic ajax function. Called from app.js, where an ajax call is passed a specific success callback.
Restructure flask routes - initial AJAX request from browser checks to make sure that user exists. Redirects to /get/display, passing screen_name as parameter, if user exists.

This allows me to check for users' existence as well as avoid repeating myself later when re-getting users' tweets.