Add tests for extended steps (tables, multi-line).

Miraculously, this has worked, right out of the box. It will be very useful once we start supporting table diffs.

features/extended-steps.feature

@@ -0,0 +1,103 @@
+Feature: Extended steps
+
+  As a user of Clucumber, I want to define multi-line steps
+  So that I can test large amounts of text or tables.
+
+Scenario: Multi-line strings
+
+  Given a standard Cucumber project directory structure
+  Given the standard clucumber setup
+  Given a file named "features/multiline.feature" with:
+  """
+  Feature: Multiline step args
+
+    Scenario: A multiline string
+    Given I have a step that takes one arg:
+    \"\"\"
+    foo
+    bar baz
+    \"\"\"
+  """
+  Given a file named "features/step_definitions/multi-line-steps.lisp" with:
+  """
+  (Given* #?{^I have a step that takes one arg:$} (string) 
+    (assert (string= string "foo
+bar baz")))
+  """
+
+
+  When I run "cucumber -f progress"
+  Then it should pass with exactly:
+  """
+  .
+
+  1 scenario (1 passed)
+  1 step (1 passed)
+
+  """
+
+Scenario: Simple Tables
+
+  Given a standard Cucumber project directory structure
+  Given the standard clucumber setup
+  Given a file named "features/multiline.feature" with:
+  """
+  Feature: Table step args
+
+    Scenario: A simple table step
+    Given I have a step that wants these args:
+    | foo |
+    | bar |
+    | baz |
+  """
+  Given a file named "features/step_definitions/table-steps.lisp" with:
+  """
+  (Given* #?{^I have a step that wants these args:$} (table) 
+    (assert (equal '(("foo") ("bar") ("baz")) table)))
+  """
+
+
+  When I run "cucumber -f progress"
+  Then it should pass with exactly:
+  """
+  .
+
+  1 scenario (1 passed)
+  1 step (1 passed)
+
+  """
+
+Scenario: Tables with an additional argument
+
+  Given a standard Cucumber project directory structure
+  Given the standard clucumber setup
+  Given a file named "features/multiline.feature" with:
+  """
+  Feature: Table step args
+
+    Scenario: A table step that matches additional args
+    Given I have step 1 that wants these args:
+    | foo |
+    | bar |
+    And I have step 2 that wants these args:
+    | wibbly |
+    | wobbly |
+  """
+  Given a file named "features/step_definitions/table-steps.lisp" with:
+  """
+  (Given* #?{^I have step (\d+) that wants these args:$} (number table) 
+    (case (parse-integer number)
+      (1 (assert (equal '(("foo") ("bar")) table)))
+      (2 (assert (equal '(("wibbly") ("wobbly")) table)))))
+  """
+
+
+  When I run "cucumber -f progress"
+  Then it should pass with exactly:
+  """
+  ..
+
+  1 scenario (1 passed)
+  2 steps (2 passed)
+
+  """