Run travis against multiple sphinx versions

.travis.yml

@@ -1,7 +1,6 @@
 language: python
 python:
   - 2.7
-  - 3.4
   - 3.5
   - 3.6
 sudo: false
@@ -15,3 +14,6 @@ notifications:
       - readthedocs:y3hjODOi7EIz1JAbD1Zb41sz#random
     on_success: change
     on_failure: always
+branches:
+  only:
+  - master

tox.ini

@@ -1,12 +1,11 @@
 [tox]
 envlist =
-    py{27,34,35,36}
+    py{27,35,36}-sphinx{16,17,18},
     lint
     docs
 
 [tox:travis]
-2.7 = py27, docs, #lint
-3.4 = py34
+2.7 = py27, docs, lint
 3.5 = py35
 3.6 = py36
 
@@ -16,7 +15,9 @@ setenv =
 deps =
     .
     pytest
-    sphinx<1.7
+    sphinx16: Sphinx < 1.7
+    sphinx17: Sphinx < 1.8
+    sphinx18: Sphinx < 1.9
 commands =
     py.test {posargs}