Allow Time.between to receive :between to deliver time in range

Closes #675

lib/faker/time.rb

@@ -12,7 +12,8 @@ class Time < Date
 
     class << self
       def between(from, to, period = :all, format = nil)
-        time_with_format(date_with_random_time(super(from, to), period), format)
+        time = period == :between ? rand(from..to) : date_with_random_time(super(from, to), period)
+        time_with_format(time, format)
       end
 
       def forward(days = 365, period = :all, format = nil)

test/test_faker_time.rb

@@ -109,5 +109,15 @@ def test_time_period
         assert period_range.include?(result.hour.to_i), "#{[:random_backward, :random_between, :random_forward][index]}: \"#{result}\" expected to be included in Faker::Time::TIME_RANGES[:#{period}] range"
       end
     end
+
+    from = Time.now
+    to   = Time.now + 100
+
+    100.times do
+      period          = :between
+      random_between  = @tester.between(from, to, period)
+      assert random_between >= from, "Expected >= \"#{from}\", but got #{random_between}"
+      assert random_between <= to  , "Expected <= \"#{to}\", but got #{random_between}"
+    end
   end
 end