Fix Include Matcher For Ranges

This is issue rspec#1191.

Previously, a few parts of the Include matcher assumed all Ranges
were iterable.  This caused it to raise errors like:
TypeError: Can't iterate from [Float|Time]

This happens because Ranges require that their beginning element implement
succ.  Float doesn't which causes the error.  Time is different because it
does implement succ but a) it's deprecated as of Ruby 1.9.2 and b) some Ruby
implementations raise an exception when trying to iterate through a range of
Time objects.

This PR does a few things:
1) Fixes the Include matcher to handle Ranges that don't support iteration, while
continuing to support Ranges that do
2) Adds specs for both types of Ranges in 1).  There weren't any for the Include matcher
used with Ranges.

lib/rspec/matchers/built_in/include.rb

@@ -163,19 +163,34 @@ def actual_collection_includes?(expected_item)
           # String lacks an `any?` method...
           return false unless actual.respond_to?(:any?)
 
+          # Some objects don't support iteration (e.g. Float, Time, etc.)
+          return actual.include?(expected_item) if non_iterable_range?(actual)
+
           actual.any? { |value| values_match?(expected_item, value) }
         end
 
         if RUBY_VERSION < '1.9'
           def count_enumerable(expected_item)
+            return actual.include?(expected_item) ? 1 : 0 if non_iterable_range?(actual)
             actual.select { |value| values_match?(expected_item, value) }.size
           end
         else
           def count_enumerable(expected_item)
+            return actual.include?(expected_item) ? 1 : 0 if non_iterable_range?(actual)
             actual.count { |value| values_match?(expected_item, value) }
           end
         end
 
+        # Determines if actual is a range and contains elements that do not support iteration.
+        # The usual requirement for a Range supporting iteration is that its beginning element
+        # implements `succ`. Time is different; it implements `succ` but that method is
+        # deprecated as of 1.9.2.  Attempting to iterate through a Range of Times raises a
+        # TypeError on many common Ruby implementations.  We treat Ranges of Time objects as
+        # non-iterable to ensure safety.
+        def non_iterable_range?(actual)
+          actual.is_a?(Range) && (!actual.min.respond_to?(:succ) || actual.min.is_a?(Time))
+        end
+
         def count_inclusions
           @divergent_items = expected
           case actual