Merge pull request #71 from MargaretLangley/master

Update of invoicing tests
refining InvoicingMaker DebitMaker - make_debit? => debit? generate => compose
Merge branch 'master' of github.com:BCS-io/letting
rubocop error
changing spec specification
removed orphan file
header raw anchor => link_to
Seedbank changes - breaking seeds.rb into subfiles
Charge added Payment type
Invoice printout, screen copy has border