add liquid comment syntax w/ tests

Includes single line comment syntax with # that ignores block wrap tag requirement (e.g. {% %} enclosing line comments) for functional usage.

tests/test_closed.diff

@@ -392,3 +392,19 @@ index 2996176..7545ccf 100644
 -	# TODO create the directory.
  	$(AR) rc $@ $(OBJ)
  
+diff --git a/tests/example_file.liquid b/tests/example_file.liquid
+index 0000000..7cccc5b 100644
+--- a/tests/example_file.liquid
++++ b/tests/example_file.liquid
+@@ -1,6 +0,0 @@
+-{% comment %} TODO: remove loop logic {% endcomment %}
+ {% for i in (1..3) -%}
+- # TODO: Do math here!
+- # labels: help wanted
+   {{ i }}
+ {% endfor %}
+-{% comment %}
+-TODO: Render Liquid file
+ {% assign featured_product = all_products["product_handle"] %}
+ {% render "product", product: featured_product %}
+-{% endcomment %}

tests/test_new.diff

@@ -435,3 +435,20 @@ index 0000000..2996176
 +	# TODO create the directory.
 +	$(AR) rc $@ $(OBJ)
 +
+diff --git a/tests/example_file.liquid b/tests/example_file.liquid
+new file mode 100644
+index 0000000..7cccc5b
+--- /dev/null
++++ b/tests/example_file.liquid
+@@ -0,0 +1,11 @@
++{% comment %} TODO: remove loop logic {% endcomment %}
++{% for i in (1..3) -%}
++ # TODO: Do math here!
++ # labels: help wanted
++  {{ i }}
++{% endfor %}
++{% comment %}
++TODO: Render Liquid file
++{% assign featured_product = all_products["product_handle"] %}
++{% render "product", product: featured_product %}
++{% endcomment %}

tests/test_todo_parser.py

@@ -99,6 +99,9 @@ class NewIssueTests(unittest.TestCase):
     def test_c_cpp_like_issues(self):
         self.assertEqual(count_issues_for_file_type(self.raw_issues, 'c_cpp'), 2)
 
+    def test_liquid_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'liquid'), 3)
+
 
 class ClosedIssueTests(unittest.TestCase):
     # Check for removed TODOs across the files specified.
@@ -186,6 +189,9 @@ class ClosedIssueTests(unittest.TestCase):
     def test_c_cpp_like_issues(self):
         self.assertEqual(count_issues_for_file_type(self.raw_issues, 'c_cpp'), 2)
 
+    def test_liquid_issues(self):
+        self.assertEqual(count_issues_for_file_type(self.raw_issues, 'liquid'), 3);
+
 
 class IgnorePatternTests(unittest.TestCase):