Drop support for Python 3.2.

Pip 8 no longer supports 3.2, so we can't sensibly support it going
forward - but folk can use an older Mock if they need 3.2 support.

.travis.yml

@@ -3,7 +3,6 @@ language: python
 python:
   - "2.6"
   - "2.7"
-  - "3.2"
   - "3.3"
   - "3.4"
   - pypy

docs/index.txt

@@ -45,7 +45,9 @@ the newest features from the latest release of Python available for all
 Pythons.
 
 The ``mock`` package contains a rolling backport of the standard library mock
-code compatible with Python 2.6 and up, and 3.2 and up.
+code compatible with Python 2.6 and up, and 3.3 and up. Python 3.2 is supported
+by mock 1.3.0 and below - with pip no longer supporting 3.2, we cannot test
+against that version anymore.
 
 Please see the standard library documentation for usage details.
 
@@ -121,7 +123,7 @@ Checkout from git (see :ref:`installing`) and submit pull requests.
 Committers can just push as desired: since all semantic development takes
 place in cPython, the backport process is as lightweight as we can make it.
 
-mock is CI tested using Travis-CI on Python versions 2.6, 2.7, 3.2, 3.3, 3.4,
+mock is CI tested using Travis-CI on Python versions 2.6, 2.7, 3.3, 3.4,
 3.5, nightly Python 3 builds, pypy, pypy3. Jython support is desired, if
 someone could contribute a patch to .travis.yml to support it that would be
 excellent.