save python 2.7 image as it contains more layers than the 3.5 image

Author: oesteban

circle.yml

@@ -23,7 +23,7 @@ dependencies:
         timeout: 1600
     - docker build -f docker/nipype_test/Dockerfile_py27 -t nipype/nipype_test:py27 . :
         timeout: 1600
-    - mkdir -p ~/docker; docker save nipype/nipype_test:py35 > ~/docker/image.tar :
+    - mkdir -p ~/docker; docker save nipype/nipype_test:py27 > ~/docker/image.tar :
         timeout: 1600
     - pip install xunitmerge