add currency localisation
add currency spec file and update some class names
another few class names
fixup docs etc
fix bug in mailer
add spree currency helper, fix some typos and specs
Merge branch 'master' into currency
Merge branch 'master' into currency

Conflicts:
	app/helpers/injection_helper.rb
	db/suburb_seeds.rb
fix typos and add missing helper
refactor and bugfix for tests
Merge branch 'master' into currency
Explain weird spree override
comit ng-tst changes elsewhere
remove to_f on decimals
Merge branch 'currency' of https://github.com/openfoodfoundation/openfoodnetwork into currency
Merge pull request #260 from openfoodfoundation/currency

Merge Currency branch