add pending feature - conditional exclusion of example groups

cucumber.yml

@@ -1 +1,2 @@
-default: --require features features
+default: --require features features
+pending: --require features features-pending

features-pending/cli/conditional_exclusion.feature

@@ -0,0 +1,39 @@
+Feature: conditional exclusion of example groups
+
+  Example groups can be excluded from a run by matching the value of the
+  --exclude argument against options passed to an example group. The value
+  can be a key or a key:value pair (separated by a ":").
+
+  Scenario: exclusion using explicit value
+    Given the following spec:
+      """
+      describe "This should run" do
+        it { 5.should == 5 }
+      end
+      
+      describe "This should not run", :slow => true do
+        it { 1_000_000.times { 5.should == 5 } }
+      end
+      """
+    When I run it with the spec command --format specdoc --exclude slow:true
+    Then the exit code should be 0
+    And the stdout should match "1 example, 0 failures"
+    And the stdout should match /This should run$/m
+    But the stdout should not match "This should not run"
+
+  Scenario: exclusion using default value (true)
+    Given the following spec:
+      """
+      describe "This should run" do
+        it { 5.should == 5 }
+      end
+
+      describe "This should not run", :slow => true do
+        it { 1_000_000.times { 5.should == 5 } }
+      end
+      """
+    When I run it with the spec command --format specdoc --exclude slow
+    Then the exit code should be 0
+    And the stdout should match "1 example, 0 failures"
+    And the stdout should match /This should run$/m
+    But the stdout should not match "This should not run"