Merge branch 'release/v0.7.x'

Conflicts:
	setup.cfg
	setup.py

arpeggio/__init__.py

@@ -930,7 +930,8 @@ class Parser(object):
         self.line_ends = []
         self.input = _input
         self.parser_model.clear_cache()
-        self.comments_model.clear_cache()
+        if self.comments_model:
+            self.comments_model.clear_cache()
         self.parse_tree = self._parse()
 
         # In debug mode export parse tree to dot file for

setup.py

@@ -49,7 +49,7 @@ setup(
         'Topic :: Software Development :: Libraries :: Python Modules',
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
-        'Programming Language :: Python',
+        'Programming Language :: Python'
         ]
 
 )