Dropped support for python 2.6 and added python 3.5

.travis.yml

@@ -6,12 +6,12 @@ env:
   - BOB_UPLOAD_WHEEL=1
 matrix:
   include:
-  - python: 2.6
   - python: 2.7
     env:
     - BOB_DOCUMENTATION_SERVER=https://www.idiap.ch/software/bob/docs/latest/bioidiap/%s/master
   - python: 3.3
   - python: 3.4
+  - python: 3.5
 before_install:
 - sudo add-apt-repository -y ppa:biometrics/bob
 - sudo apt-get update -qq