start the removal of python 2.6/3.3 support

tox.ini

@@ -4,7 +4,6 @@ distshare = {homedir}/.tox/distshare
 # make sure to update environment list in travis.yml and appveyor.yml
 envlist =
     linting
-    py26
     py27
     py33
     py34
@@ -27,13 +26,6 @@ deps =
     mock
     requests
 
-[testenv:py26]
-# pinning mock to last supported version for python 2.6
-deps =
-    hypothesis<3.0
-    nose
-    mock<1.1
-
 [testenv:py27-subprocess]
 changedir = .
 deps =
@@ -54,7 +46,7 @@ deps =
     pygments
     restructuredtext_lint
 commands =
-    flake8 pytest.py _pytest testing
+    flake8 pytest.py _pytest testing setup.py pytest.py
     {envpython} scripts/check-rst.py
 
 [testenv:py27-xdist]
@@ -174,7 +166,7 @@ usedevelop = True
 deps =
     autopep8
 commands =
-    autopep8 --in-place -r --max-line-length=120 --exclude=test_source_multiline_block.py _pytest testing
+    autopep8 --in-place -r --max-line-length=120 --exclude=test_source_multiline_block.py _pytest testing setup.py pytest.py
 
 [testenv:jython]
 changedir = testing