Merge pull request #100 from MargaretLangley/master

Printing values set for invoice print out, screens & template
fadetoggle => slidetoggle
Invoicing edit: n + 1 fix, displays first 2 charges
invoice_decorator: Property ID => Property. spacing changes
Merge pull request #101 from MargaretLangley/master

Adding renders and replacing blank lines with botton-spacer
Merge pull request #102 from MargaretLangley/master

Templates view corrected, reduntant flt class overwritten with float cla...
Merge pull request #103 from MargaretLangley/master

Invoices screen view single print, double print invoices show
Invoicing refactoring
refactor invoice
Invoice has concept of needing a backpage or not
New Page for Screen view of multiple prints