Revert "Collate months that have negative gifts, fixes #4"

This reverts commit 6bdf953a53c59552865a253961b30d5a563891d9.
Revert "Revert "Collate months that have negative gifts, fixes #4""

This reverts commit 83dad04997842081c167982642384ea52f0af11f.
= != ==
Send login success report on untested organisation, closes #18