Improve dependency links

issue7049

setup.py

@@ -80,6 +80,7 @@ setup(name=name,
             'test_geographic_fields = trytond_gis.tests',
             ],
         },
+    dependency_links=dependency_links,
     zip_safe=False,
     test_suite='trytond.tests',
     test_loader='trytond.test_loader:Loader',

tox.ini

@@ -1,13 +1,11 @@
 [tox]
-envlist = {py27,py34,py35,py36}-postgis
+envlist = py27,py34,py35,py36
 
 [testenv]
 commands = {envpython} setup.py test
 deps =
     mock
-    {py27,py34,py35,py36}-postgis: psycopg2 >= 2.5
 setenv =
-    postgis: TRYTOND_DATABASE_URI={env:POSTGIS_URI:postgis://}
-    postgis: DB_NAME={env:POSTGIS_NAME:test}
-install_command = pip install --pre --find-links https://trydevpi.tryton.org/ {opts} {packages}
-
+    TRYTOND_DATABASE_URI={env:POSTGIS_URI:postgis://}
+    DB_NAME={env:POSTGIS_NAME:test}
+install_command = pip install --pre --process-dependency-links {opts} {packages}