Remove files related to gateway backend
Update README
Update Gemfile
Update Rakefile
Update gemspec file
Remove references to old backend
Use local variable in import_quotes task
Refactor update_quote use case
Remove text errors from quote_boundary_spec
Remove reference to backend spec from service_spec
Remove reference to backend from use_case_spec
Refactor delete_quote_spec
Remove reference to backend from import_quotes
Use 'require' rather than require_relative
Move lib/support ~> lib/helpers
Get all gateway specs working again