Revamp styling with Michael's changes

The app's home page has been changed to improve the design and user
interaction. Michael's changes from the jsbin
http://jsbin.com/yoguwuco/5/edit have been added as part of this
change. The changes include:

 - Larger, centered questions which are easier to read.

 - Added spacing between the questions.

 - Centered the navigation bar at the bottom for better interaction on a
   desktop browser.

   Closes #2
General app.js code cleanup

Addressed inefficient JQuery usage, add/delete comments, etc.

NOTE: We are using commit message best practices, outline here:
http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
Removed Twitter data from posts
Logging features and navigation enhancements

Allow user to control navigation between log pages via Bootstraps
navbar, and allowed an anonymous login to take the Ecometrix survey.

 - Enable anonymous login by altering 'resume session' login and navbar
   logic.

 - Refactor login and user addition page navigation into the navbar.

 - Recenter and refactor navbar display to center the buttons and use
   more Bootstrap features.

Closes #4
Reformat app.js, and add/delete comments
Minor update to login pages

Refactor and re-format login javascript.
Remove old style sheet since the login is using the same style sheets
as the main app.