Rename occasion (FIXME: does not save)
WIP: gift receivers
Revert "WIP: gift receivers"

This reverts commit 098809064965d6538f510a55c6c5604cf2a1ee01.
Revert "Rename occasion (FIXME: does not save)"

This reverts commit e24e9cdaba14255279331adcbc3e1ad1d5338704.
Add Receiver model (no functional change)
Add known issues list
Fix gifts count in occasions list
Display occasion receivers list + receiver gifts
Sort occasions by date
Gift deletion
Add receiver
Receiver deletion
Merge branch 'master' into gh-pages