Bug Fix for Issue #16

Fix to Upload widget that failed to display the Check IN page for site in non-english locale. Fix also addresses the recent changes to Required fields on the UI
Fix to UploadDone page not being reached.
BUG fix for Issue #16

- Fixed bug on selection of filename input (caused by Required field change in SP recently).
- included new (un-documented) input param to store filename input selector
- Fixed bug that was causing the iframe content to be re-processed during a pre-submit action.
Demo showcase SPA updated with latest.
Built libraries updated with latest code.