Add support for other pretty_time formats

Instead of only using a long version we add a short version too. You can add your own solidus time format by adding a format to

    your-locale:
      time:
        formats:
          solidus:
            iso: '%F'

and use it with `pretty_time(record.created_at, :iso)`.

core/app/helpers/spree/base_helper.rb

@@ -127,8 +127,8 @@ def display_price(product_or_variant)
       product_or_variant.price_for(current_pricing_options).to_html
     end
 
-    def pretty_time(time)
-      I18n.l(time, format: :solidus_long)
+    def pretty_time(time, format = :long)
+      I18n.l(time, format: :"solidus.#{format}")
     end
 
     def link_to_tracking(shipment, options = {})

core/config/locales/en.yml

@@ -701,7 +701,9 @@ en:
               has_to_be_payment_source_class: "has to be a Spree::PaymentSource"
   time:
     formats:
-      solidus_long: '%B %d, %Y %l:%M %p'
+      solidus:
+        long: '%B %d, %Y %-l:%M %p'
+        short: "%b %-d '%y %-l:%M%P"
   devise:
     confirmations:
       confirmed: Your account was successfully confirmed. You are now signed in.

core/spec/helpers/base_helper_spec.rb

@@ -130,6 +130,14 @@ def link_to_tracking_html(options = {})
     it "pretty prints time in long format" do
       is_expected.to eq "November 06, 2012 1:33 PM"
     end
+
+    context 'with format set to short' do
+      subject { pretty_time(date, :short) }
+
+      it "pretty prints time in short format" do
+        is_expected.to eq "Nov 6 '12 1:33pm"
+      end
+    end
   end
 
   context "plural_resource_name" do