add with_sequence lookup plugin

Plugin allows you to do easy counts for items.

test/TestPlayBook.py

@@ -172,9 +172,9 @@ class TestPlaybook(unittest.TestCase):
        print utils.jsonify(actual, format=True)
        expected =  {
            "localhost": {
-               "changed": 7,
+               "changed": 9,
                "failures": 0,
-               "ok": 9,
+               "ok": 14,
                "skipped": 1,
                "unreachable": 0
            }   
@@ -185,7 +185,7 @@ class TestPlaybook(unittest.TestCase):
        assert utils.jsonify(expected, format=True) == utils.jsonify(actual,format=True)
 
        print "len(EVENTS) = %d" % len(EVENTS)
-       assert len(EVENTS) == 26
+       assert len(EVENTS) == 60
 
    def test_includes(self):
        pb = os.path.join(self.test_dir, 'playbook-includer.yml')

test/lookup_plugins.yml

@@ -26,6 +26,25 @@
   - name: test LOOKUP and PIPE
     action: command test "$LOOKUP(pipe, cat sample.j2)" = "$PIPE(cat sample.j2)"
 
+  - name: test with_sequence, generate
+    command: touch /tmp/seq-${item}
+    with_sequence: 0-16/2:%02x
+
+  - name: test with_sequence, fenceposts 1
+    copy: src=/tmp/seq-00 dest=/tmp/seq-10
+
+  - name: test with_sequence, fenceposts 2
+    file: dest=/tmp/seq-${item} state=absent
+    with_items: [11, 12]
+
+  - name: test with_sequence, missing
+    file: dest=/tmp/seq-${item} state=absent
+    with_sequence: 0x10/02:%02x
+
+  - name: test with_sequence,remove
+    file: dest=/tmp/seq-${item} state=absent
+    with_sequence: 0-0x10/02:%02x
+
   - name: ensure test file doesnt exist
     # command because file will return differently
     action: command rm -f /tmp/ansible-test-with_lines-data