Make name optional

README.md

@@ -52,10 +52,13 @@ gem "business", "~> 2.0"
 
 Get started with business by creating an instance of the calendar class, that accepts a hash that specifies which days of the week are considered working days, which days are holidays and which are extra working dates.
 
+Additionally each calendar instance can be given a name. This can come in handy if you use multiple calendars.
+
 ```ruby
 calendar = Business::Calendar.new(
+  name: 'my calendar',
   working_days: %w( mon tue wed thu fri ),
-  holidays: ["01/01/2014", "03/01/2014"]    # array items are either parseable date strings, or real Date objects
+  holidays: ["01/01/2014", "03/01/2014"],    # array items are either parseable date strings, or real Date objects
   extra_working_dates: [nil], # Makes the calendar to consider a weekend day as a working day.
 )
 ```

lib/business/calendar.rb

@@ -59,7 +59,7 @@ def self.load_cached(calendar)
 
     attr_reader :name, :holidays, :working_days, :extra_working_dates
 
-    def initialize(name:, extra_working_dates: nil, working_days: nil, holidays: nil)
+    def initialize(name: nil, extra_working_dates: nil, working_days: nil, holidays: nil)
       @name = name
       set_extra_working_dates(extra_working_dates)
       set_working_days(working_days)

spec/business/calendar_spec.rb

@@ -81,6 +81,18 @@
     end
   end
 
+  describe ".new" do
+    it "allows to skip a name" do
+      instance = described_class.new
+      expect(instance.name).to eq nil
+    end
+
+    it "allows to set a name" do
+      instance = described_class.new(name: "foo")
+      expect(instance.name).to eq "foo"
+    end
+  end
+
   describe "#set_working_days" do
     subject(:set_working_days) { calendar.set_working_days(working_days) }