moved concat to utils, fixed a few docstrings, fixed memory leak in _speedups.escape

--HG--
branch : trunk
diff --git a/setup.py b/setup.py
index 0c4fb31..7fe263d 100644
--- a/setup.py
+++ b/setup.py
@@ -120,8 +120,7 @@
     ],
     packages=['jinja2'],
     data_files=[
-        ('docs/html', list(list_files('docs/html'))),
-        ('docs/txt', list(list_files('docs/src')))
+        ##('docs', list(list_files('docs/_build/html')))
     ],
     features={
         'speedups': Feature("optional C speed-enhancements",