Move twttr.ready() and dynamic timeline creation function to showTweets function in data_viz script. Called when user clicks a bubble, displays user's timeline in #tweets div.

 - Empties previous timeline with .empty()
 - WIP: remove my widget ID, don't hard-code number of tweets
Modify .then callback in createTimeline to provide failure callback. Remove getElemById parameter, replace with jQuery equivalent.
Set width of svg to the width of containing #viz div, minus margins.
Remove #panel div from index.html, insert into div (detail-container) only on success in displaySuccess callback.

 - Only will show side panel on successful display of friends.
Changed header text above visualize button to be more clear about what the purpose of the app is.
Add comments to app.js button-click event handler. WIP: progress bar.
deleted static/.sass-cache - duplicate of sass cache inside politwit foundation project
Add functions to app.js that add progress bar to site, show progress complete.

These functions are called before and during the success callback.
However, they are a work in progress - they don't currently reflect the real state of data transfer.
Minor change to timeout function, to complete progress bar and empty div with less delay