Add Json-RPC API for Python
Add subtasks to the dashboard
Rename template file, fix #394
Move category template to a subfolder
Add graph for user repartition
Use Pimple instead of Core\Registry and add Monolog for logging
Move some class instancaiations outside the router
Attach events only for board controller
Add pagination and sorting to the dashboard
Don't display analytics if not enough data
Add script to find missing locales and update locales (pull-request #393)
Add Json-RPC API for Python (pull-request #390)
Add contributor
Remove condition
Add cumulative flow diagram
Hide pagination when not necessary
Add daily project summary export
docs, update: tell users to copy entire `data` dir

Previously, the document told users to only copy `data/db.sqlite`.
However, if there are attachments uploaded (stored in `data/files`),
they will be lost.
To solve this, this commit changes the doc so it tells users
to copy the entire `data` dir.
Fix date due ordering on the dashboard, see #403
Description should not be mandatory, see #400