Modernize BYSETPOS commit

A few small updates to Nicolas Marlier's BYSETPOS support added in
PR ice-cube-ruby#349

lib/ice_cube/validations/monthly_by_set_pos.rb

@@ -3,7 +3,7 @@ module IceCube
   module Validations::MonthlyBySetPos
 
     def by_set_pos(*by_set_pos)
-      return by_set_pos([by_set_pos]) if by_set_pos.is_a?(Fixnum)
+      return by_set_pos([by_set_pos]) if by_set_pos.is_a?(Integer)
 
       unless by_set_pos.nil? || by_set_pos.is_a?(Array)
         raise ArgumentError, "Expecting Array or nil value for count, got #{by_set_pos.inspect}"
@@ -48,9 +48,7 @@ def validate(step_time, schedule)
           s.add_recurrence_rule IceCube::Rule.from_hash(rule.to_hash.reject{|k, v| [:by_set_pos, :count, :until].include? k})
         end
 
-        puts step_time
         occurrences = new_schedule.occurrences_between(start_of_month, end_of_month)
-        p occurrences
         index = occurrences.index(step_time)
         if index == nil
           1

lib/ice_cube/validations/yearly_by_set_pos.rb

@@ -3,7 +3,7 @@ module IceCube
   module Validations::YearlyBySetPos
 
     def by_set_pos(*by_set_pos)
-      return by_set_pos([by_set_pos]) if by_set_pos.is_a?(Fixnum)
+      return by_set_pos([by_set_pos]) if by_set_pos.is_a?(Integer)
 
       unless by_set_pos.nil? || by_set_pos.is_a?(Array)
         raise ArgumentError, "Expecting Array or nil value for count, got #{by_set_pos.inspect}"

spec/examples/from_ical_spec.rb

@@ -88,7 +88,7 @@ module IceCube
 
     it 'should be able to parse by_set_pos start (BYSETPOS)' do
       rule = IceCube::Rule.from_ical("FREQ=MONTHLY;BYDAY=MO,WE;BYSETPOS=-1,1")
-      rule.should == IceCube::Rule.monthly.day(:monday, :wednesday).by_set_pos([-1, 1])
+      expect(rule).to eq(IceCube::Rule.monthly.day(:monday, :wednesday).by_set_pos([-1, 1]))
     end
 
     it 'should return no occurrences after daily interval with count is over' do