Use newer cython.

Author: methane

.travis.yml

@@ -6,10 +6,9 @@ env:
     - PIP_USE_MIRRORS=true
 
 install:
-    - pip install --use-mirrors tox
     - sudo apt-get update -qq
-    - sudo apt-get install -q cython
-    - sudo apt-get install -q python2.6-dev python2.7-dev python3.2-dev python3.3-dev
+    - sudo apt-get install -q python3.3-dev
+    - pip install --use-mirrors tox cython
     - cython --cplus msgpack/_packer.pyx
     - cython --cplus msgpack/_unpacker.pyx