Drop support for Python 3.2

It's not supported by pip anymore (see pypa/pip#3390)
and not by the PSF either (see https://www.python.org/dev/peps/pep-0392/).

.travis.yml

@@ -2,23 +2,19 @@ language: python
 cache: pip
 matrix:
   include:
-  - python: 2.6
+  - python: "2.6"
     env: TOXENV=py26
-  - python: 2.7
+  - python: "2.7"
     env: TOXENV=py27
-  - python: 3.2
-    env: TOXENV=py32
-  - python: 3.3
+  - python: "3.3"
     env: TOXENV=py33
-  - python: 3.4
+  - python: "3.4"
     env: TOXENV=py34
-  - python: 3.5
+  - python: "3.5"
     env: TOXENV=py35
-  - python: 3.6
-    env: TOXENV=flake8
-  - python: 3.6
+  - python: "3.6"
     env: TOXENV=py36
-  - python: pypy
+  - python: "pypy"
     env: TOXENV=pypy
 install:
   - travis_retry pip install tox

setup.py

@@ -16,7 +16,6 @@
                    "Operating System :: OS Independent",
                    "Programming Language :: Python :: 2.6",
                    "Programming Language :: Python :: 2.7",
-                   "Programming Language :: Python :: 3.2",
                    "Programming Language :: Python :: 3.3",
                    "Programming Language :: Python :: 3.4",
                    "Programming Language :: Python :: 3.5",

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist=py{26,27,32,33,34,35,36,py},flake8
+envlist=py{26,27,33,34,35,36,py},flake8
 
 [testenv]
 commands=