On Python 2.x test using zc.buildout 1.x and 2.x on Travis

.travis.yml

@@ -5,9 +5,13 @@ python:
     - 3.2
     - 3.3
 
+env:
+    - BUILDOUT_VERSION='<2.0.0'
+    - BUILDOUT_VERSION='>=2.0.0'
+
 install:
     - if [[ $TRAVIS_PYTHON_VERSION == '2.6' ]]; then pip install --use-mirrors unittest2; fi
-    - if [[ $TRAVIS_PYTHON_VERSION == 2* ]]; then pip install --use-mirrors 'zc.buildout<2.0.0'; fi
+    - if [[ $TRAVIS_PYTHON_VERSION == 2* ]]; then pip install --use-mirrors zc.buildout${BUILDOUT_VERSION}; fi
     - if [[ $TRAVIS_PYTHON_VERSION == 3* ]]; then pip install --use-mirrors 'zc.buildout>=2.0.0' zope.testing manuel; fi
     - python setup.py install