Downgrade repoze.tm2 to 1.0, refs #64.

This avoids the `AssertionError: app must call start_response before returning`
error message.

requirements.txt

@@ -35,7 +35,7 @@ persistent==4.2.1
 python-gettext==3.0
 pytz==2016.6.1
 repoze.retry==1.4
-repoze.tm2==2.1
+repoze.tm2==1.0
 six==1.10.0
 tempstorage==3.0
 transaction==1.6.1

src/Zope2/utilities/skel/etc/zope.ini.in

@@ -4,7 +4,8 @@ zope_conf = %(here)s/wsgi.conf
 
 [pipeline:main]
 pipeline =
-#    egg:repoze.retry#retry
+    egg:paste#httpexceptions
+    egg:repoze.retry#retry
     egg:repoze.tm2#tm
     zope
 

versions-prod.cfg

@@ -31,7 +31,7 @@ python-gettext = 3.0
 pytz = 2016.6.1
 Record = 3.1
 repoze.retry = 1.4
-repoze.tm2 = 2.1
+repoze.tm2 = 1.0
 RestrictedPython = 3.6.0
 six = 1.10.0
 tempstorage = 3.0