Changed the 'rda' usage to 'rds' in documentation and example files.
Added ressources to use 'Progress' functions based on shiny-incubator progress.
Added js and css to use jasny's bootstrap upload wigdet.
Added jasny's bootstrap style upload widgets.
Added progress indicators (based on shiny-incubator's progress class).
Changed the .Rda loading for .RDS.
Various small corrections and version change