Drop py26 and py33 from Travis and tox

Since it appears that Travis CI doesn't support them anymore

Author: singingwolfboy

.travis.yml

@@ -5,15 +5,8 @@ cache: pip
 
 matrix:
   include:
-    - python: 2.6
-      env: TOXENV=py26
-      dist: trusty
     - python: 2.7
       env: TOXENV=py27
-    - python: 3.3
-      env: TOXENV=py33
-      dist: trusty
-      sudo: false
     - python: 3.4
       env: TOXENV=py34
     - python: 3.5
@@ -38,7 +31,7 @@ before_script:
   - if [[ $TRAVIS_PYTHON_VERSION == *.7 ]]; then
       pip install flake8;
       flake8 . --count --exit-zero --select=E901,E999,F821,F822,F823 --show-source --statistics;
-      flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics; 
+      flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics;
     fi
 
 script:

tox.ini

@@ -1,9 +1,8 @@
 [tox]
-envlist = py26,py27,py33,py34,py35,py36,py37
+envlist = py27,py34,py35,py36,py37
 
 [testenv]
 deps =
     pytest
     unittest2
-    py26: importlib
 commands = pytest {posargs}