add From.js Class. Skeleton only
add functions.js to include all helper functions.
        - addEvent function added
completed validation functions
completed main validation logic in main.js
validation complete
removed validation.js - no longer needed
added meta viewport data
added Skybill.js file, added <script> tag to index.htm
Added properties to Skybill class
added parseDate helper function
added dayDiff helper function
added public methods/properties to Skybill
removed calcualte.js, moved view logic to main.js
added Google Anlytics tracking code
added user visible version number
updated version number, minor styling updates