Add transaction date fallback
Merge branch 'master' of https://github.com/caprenter/IATI-Stats

Conflicts:
	stats.py
Add license
Use decimal consistently and improve stats
Fix start year behaviour
Add options to run specific test and folders

fixes #6
fixes #5
Add invert script
Add git based stats aggregation
ChartJS attempt
Add rickshaw graphs
Add file level stats
Ensure sensible and correct git dataset is produced
Integrate gitdate
Try to catch all errors
Github pages fix
Change graph scaling
Catch unicode errors
Update README
Create function for debug messages, fixes #3
Allow stats module to be specified, fixes #7