Use unicodecsv module to allow export of groups

The groups CSV export was crashing due to unicode in group names. Use
the unicodecsv module to provide a unicode-safe CSV renderer.

h/renderers.py

@@ -2,7 +2,7 @@
 # Taken from:
 # https://pyramid-cookbook.readthedocs.org/en/latest/templates/customrenderers.html
 # with minor modifications
-import csv
+import unicodecsv as csv
 from h._compat import StringIO
 
 

h/test/renderers_test.py

@@ -19,3 +19,13 @@ def test_render_simple_csv():
              'rows': [[1, 2], [3, 4]]}
 
     assert renderer(value, sys) == "One,Two\r\n1,2\r\n3,4\r\n"
+
+
+def test_render_unicode_csv():
+    renderer = renderers.CSV({})
+    req = DummyRequest()
+    sys = {'request': req}
+    value = {'header': [u'ӓ', u'č'],
+             'rows': [[u'ñ', u'あ'], [u'ﺕ', u'Ӫ']]}
+
+    assert renderer(value, sys) == u"ӓ,č\r\nñ,あ\r\nﺕ,Ӫ\r\n".encode('utf-8')

setup.py

@@ -63,6 +63,7 @@ def run_tests(self):
     'pyramid-jinja2>=2.3.3',
     'raven>=5.8.0,<5.9.0',
     'requests>=2.7.0',
+    'unicodecsv>=0.14.1,<0.15',
     'ws4py>=0.3,<0.4',
     'zope.sqlalchemy>=0.7.6,<0.8.0',