Add appicon
Merge branch 'master' of https://github.com/Grouped/Grouped

# By Kevin Zeng
# Via Kevin Zeng
* 'master' of https://github.com/Grouped/Grouped:
  Added default 1 hour + end time. End time for a newly created group is always in the future. If made on minutes before the current time, it adds a day. (Should warn user?)