Drop support for Python 2.6 and 3.2.

- 2.6 is long out-of-maintenance, and a security quagmire.

- 3.2 cannot be tested on Travis.

.travis.yml

 language: python
 sudo: false
 python:
-    - 2.6
     - 2.7
-    - 3.2
     - 3.3
     - 3.4
     - 3.5
@@ -12,6 +10,6 @@ python:
 install:
     - pip install .
 script:
-    - python setup.py test -q
+    - python setup.py -q test -q
 notifications:
     email: false

CHANGES.rst

@@ -4,6 +4,8 @@
 4.3.0 (TBD)
 -----------
 
+- Drop support for Python 2.6 and 3.2.
+
 - The pure-Python implementation, used on PyPy and when a C compiler
   isn't available for CPython, now pickles identically to the C
   version. Unpickling will choose the best available implementation.

setup.py

@@ -122,10 +122,8 @@ setup(name='BTrees',
         "License :: OSI Approved :: Zope Public License",
         "Programming Language :: Python",
         'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.2',
         'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',

tox.ini

@@ -2,8 +2,8 @@
 envlist =
 # Jython support pending 2.7 support, due 2012-07-15 or so.  See:
 # http://fwierzbicki.blogspot.com/2012/03/adconion-to-fund-jython-27.html
-#   py26,py27,py32,jython,pypy,coverage,docs
-    py26,py27,py27-pure,pypy,py32,py33,py34,py35,pypy3,w_zodb,coverage,docs
+#   py27,jython,pypy,coverage,docs
+    py27,py27-pure,pypy,py33,py34,py35,pypy3,w_zodb,coverage,docs
 
 [testenv]
 deps =
@@ -11,7 +11,7 @@ deps =
     persistent
     transaction
 commands =
-    python setup.py test -q
+    python setup.py -q test -q
 
 [testenv:py27-pure]
 basepython =
@@ -21,7 +21,7 @@ setenv =
 deps =
     {[testenv]deps}
 commands =
-    python setup.py test -q
+    python setup.py -q test -q
 
 #[testenv:jython]
 #commands =
@@ -31,7 +31,7 @@ commands =
 basepython =
     python2.7
 commands =
-    python setup.py test -q
+    python setup.py -q test -q
 deps =
     zope.interface
     persistent