Final release for Oct 2020

v0.2.1

[FIX] Fixes #57 (missing spinner issue) (#58)

Smooth running app with full functionality

Feature/version 02 (#50)

* [FIX] Add missing tidyr dependency
* [FIX] Explicitly use lubridate::date() instead of date()
* [CLEANUP] Turn off summary stats tab (not yet implemented)
* [PROCESS-FLOW] Add time since case start (per event)
* [CLEANUP] Remove obsolete comments
* [SUMMARY-STATS] Add n_cases and n_events per activity plots
* [SUMMARY-STATS] Show number of cases, events and activities
* [SUMMARY-STATS] Throughput times per case plot
* [LAYOUT] Set default_color
* [README] Update README
* [GITIGNORE] Ignore .Rproj file