Add amount in original currency to Comprobante
Add validations to Comprobante and specs
Render original amount fields on comprobante show
Improve filters for original amount fields
Add automatic calculation of net amount from amount in original currency
Simplify binding of event on multiple fields
Add currencies administration
Fix label_for
Add unique validation to currencies by name
Fix redirect after update or create a currency
Change order of fields
Fixes in filters using original amount fields
Add space between unit and original amount. Fix order of fields in comprobante
Merge branch 'master' into amount_in_original_currency

Conflicts:
	app/filters/comprobante_filter.rb
Add original currency columns to csv report