Added 2 persistance mechanisms. Web browser local storage and external file.
Changed the default behaviour if webapp.html page. Now, if the user has saved
word to the web brower's local storage, that data is retrieved and painted as the working
document.

Minor change to UI. Moved dialogs from the top navigation bar. When working from an empty
document, the navbar's height would expand to accomodate the dialogs, hding the rows and columns
the user is adding. Moved the dialog to just below the nav bar (top right).