Use a first ZServer release.

buildout.cfg

@@ -19,7 +19,6 @@ parts =
     requirements
 sources-dir = develop
 auto-checkout =
-    ZServer
 
 
 [test]

requirements.txt

@@ -22,6 +22,7 @@ WebTest==2.0.23
 ZConfig==3.1.0
 ZEO==5.0.1
 ZODB==5.0.0
+ZServer==4.0a1
 five.globalrequest==1.0
 mechanize==0.2.5
 persistent==4.2.1

versions-prod.cfg

@@ -83,4 +83,4 @@ zope.testing = 4.5.0
 zope.testrunner = 4.5.1
 zope.traversing = 4.1.0
 zope.viewlet = 4.0.0
-ZServer =
+ZServer = 4.0a1