drop support for python 2.6

it still works (for now...) but the tests fail, because py 2.6 unittest
is old and broken

Author: Thomas Grainger

.travis.yml

@@ -2,7 +2,6 @@ sudo: false
 language: python
 python: "3.5"
 env:
-  - TOX_ENV=py26
   - TOX_ENV=py27
   - TOX_ENV=py33
   - TOX_ENV=py34

setup.py

@@ -37,7 +37,6 @@
         "Topic :: Text Processing",
         "Programming Language :: Python",
         "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.6",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.3",

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{26,27,33,34,35,36}, lint
+envlist = py{27,33,34,35,36}, lint
 
 [testenv]
 commands = nosetests {posargs}