Rename Commands and Traits for simplicity purposes
Initial work on individual invoices
Add new index to allow faster searches by extension number when preparing individual invoices
Rename variables and correct documentation
Work in progress: individual invoice
We are getting closer to having ready the individual invoicing
Add jpgraph library
Add InvoiceSummaryRepository for easily calculating sums and averages
Cosmetic fixes
Calculate totals, averages and create very early graphs
Use ga_tracking variable in base.html.twig
Merge branch 'master' into restful

Conflicts:
	composer.json (manually merged)