remove tests and docs for python 2.6 and 3.3

tox.ini

@@ -1,15 +1,14 @@
 [tox]
 envlist =
-    py{36,35,34,33,27,26,py}
+    py{36,35,34,27,py}
     py{36,27,py}-simplejson
-    py{36,33,27,26,py}-devel
-    py{36,33,27,26,py}-lowest
+    py{36,27,py}-devel
+    py{36,27,py}-lowest
     docs-html
     coverage-report
 
 [testenv]
 passenv = LANG
-usedevelop = true
 deps =
     pytest>=3
     coverage
@@ -29,6 +28,7 @@ deps =
     devel: https://github.com/pallets/click/archive/master.tar.gz
 
     simplejson: simplejson
+
 commands =
     # the examples need to be installed to test successfully
     pip install -e examples/flaskr -q
@@ -59,8 +59,6 @@ passenv = CI TRAVIS TRAVIS_*
 deps = codecov
 skip_install = true
 commands =
-    # install argparse for 2.6
-    python -c 'import sys, pip; sys.version_info < (2, 7) and pip.main(["install", "argparse", "-q"])'
     coverage combine
     coverage report
     codecov