Add tests for Python 3.6 & Python 3.7

.travis.yml

@@ -21,18 +21,22 @@ before_script:
   # Add an IPv6 config - see the corresponding Travis issue
   # https://github.com/travis-ci/travis-ci/issues/8361
   # Taken from https://github.com/travis-ci/travis-ci/issues/8361#issuecomment-350497804
-  - if [ "${TRAVIS_OS_NAME}" == "linux" ]; then 
+  - if [ "${TRAVIS_OS_NAME}" == "linux" ]; then
       sudo sh -c 'echo 0 > /proc/sys/net/ipv6/conf/all/disable_ipv6';
     fi
 
 jobs:
   include:
-    - python: 3.5
-      env: TOX_ENV=py35
-    - python: 3.5
+    - python: 3.7
+      env: TOX_ENV=py37
+    - python: 3.7
       env: TOX_ENV=docs
-    - python: 3.5
+    - python: 3.7
       env: TOX_ENV=flake8
+    - python: 3.6
+      env: TOX_ENV=py36
+    - python: 3.5
+      env: TOX_ENV=py35
     - python: 3.4
       env: TOX_ENV=py34
     - python: 2.7

circus/tests/venv/lib/python3.6/orig-prefix.txt

@@ -0,0 +1 @@
+/Library/Frameworks/Python.framework/Versions/3.5

circus/tests/venv/lib/python3.6/site-packages/easy-install.pth

@@ -0,0 +1,3 @@
+import sys; sys.__plen = len(sys.path)
+./pip-7.7-py3.5.egg
+import sys; new=sys.path[sys.__plen:]; del sys.path[sys.__plen:]; p=getattr(sys,'__egginsert',0); sys.path[p:p]=new; sys.__egginsert = p+len(new)