Merge pull request #16 from is603fa14/dev

Merge DEV into master
Correct bug for t-distribution when num. weeks = 1
Add space between model descriptor and form in xs
Clean-up source code
Clean-up styles and HTML templates
Update line graph to show all weeks back
Clean-up charts on homepage
Add ability to download XML data
Merge pull request #17 from thierer1/dev

Finalize and clean-up code and functionality