Install buildout with pip to avoid infinite restart of buildout

.gitignore

@@ -23,3 +23,6 @@ parts/
 src/collective.*
 src/plone.*
 var/
+/share/
+/local
+/pip-selfcheck.json

.travis.yml

@@ -17,15 +17,13 @@ matrix:
   allow_failures:
   - env: PLONE_VERSION=5.1
   fast_finish: true
-before_install:
-# FIXME: I have no idea how and why six==1.11.0 is being installed
-- pip uninstall -y six
 install:
-- sed -ie "s#test-4.3#test-$PLONE_VERSION#" buildout.cfg
-- sed -ie "s#versions-4.3#versions-$PLONE_VERSION#" buildout.cfg
-- python bootstrap.py
-- bin/buildout buildout:test-eggs=$TEST_EGGS annotate
-- bin/buildout buildout:test-eggs=$TEST_EGGS
+  - sed -ie "s#test-4.3#test-$PLONE_VERSION#" buildout.cfg
+  - sed -ie "s#versions-4.3#versions-$PLONE_VERSION#" buildout.cfg
+  - virtualenv .
+  - bin/pip install -r requirements.txt
+  - bin/buildout buildout:test-eggs=$TEST_EGGS annotate
+  - bin/buildout buildout:test-eggs=$TEST_EGGS
 before_script:
   - firefox -v
 script:

requirements.txt

@@ -0,0 +1,3 @@
+-c https://dist.plone.org/release/5.1-latest/requirements.txt
+setuptools
+zc.buildout

versions-4.3.x.cfg

@@ -1,2 +1,5 @@
 [versions]
+setuptools = 40.8.0
+zc.buildout = 2.13.1
+
 collective.js.bootstrap = 2.3.1.1