added Python 3.5 to build matrix and tox configs;

fixed Python 3.2 compatibility for testing
[skip ci]

.travis.yml

@@ -1,5 +1,6 @@
 language: python
 python:
+  - "3.5"
   - "3.4"
   - "3.3"
   - "3.2"
@@ -9,8 +10,11 @@ python:
 matrix:
   include:
     # add a pep8 test
-    - python: 3.4
+    - python: 3.5
       env: TOXENV=pep8
+    # add a test of setup.py using python 3.5
+    - python: 3.5
+      env: TOXENV=setup35
     # add a test of setup.py using python 3.4
     - python: 3.4
       env: TOXENV=setup34

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = pypy, pypy3, py27, py32, py33, py34, pep8, setup34, setup33, setup32, setup27
+envlist = pypy, pypy3, py27, py32, py33, py34, py35, pep8, setup35, setup34, setup33, setup32, setup27
 skipsdist = True
 
 [pytest]
@@ -14,47 +14,62 @@ max-line-length = 160
 [testenv]
 passenv = HOME ARCHFLAGS LDFLAGS CFLAGS INCLUDE LIB LD_LIBRARY_PATH PATH
 deps =
-    py{py,py3,27,33,34}: cryptography>=0.8
-    py32: cryptography>=0.8,<0.9
-    py32: cffi<=1.1.0
+# deps for everything
     enum34
     pyasn1
     six>=1.7.2
     singledispatch
     pytest
     pytest-cov
+# deps for python != 3.2
+    py{py,py3,27,33,34,35}: cryptography>=0.8
+# py32 is getting annoying to support
+    py32: cryptography>=0.8,<0.9
+    py32: cffi<=1.1.0
+    py32: coverage<=3.7.1
 install_command = pip install {opts} --no-cache-dir {packages}
 commands =
     py.test --cov pgpy --cov-report term-missing tests/
 
 [test-setup]
+whitelist_externals = /usr/bin/rm
 commands =
     pip install -e .
     rm -rf PGPy.egg-info
 
+[testenv:setup35]
+recreate = True
+basepython = python3.5
+whitelist_externals = {[test-setup]whitelist_externals}
+commands = {[test-setup]commands}
+
 [testenv:setup34]
 recreate = True
 basepython = python3.4
+whitelist_externals = {[test-setup]whitelist_externals}
 commands = {[test-setup]commands}
 
 [testenv:setup33]
 recreate = True
 basepython = python3.3
+whitelist_externals = {[test-setup]whitelist_externals}
 commands = {[test-setup]commands}
 
 [testenv:setup32]
 recreate = True
 basepython = python3.2
+whitelist_externals = {[test-setup]whitelist_externals}
 commands = {[test-setup]commands}
 
 [testenv:setup27]
 recreate = True
 deps = pip
 basepython = python2.7
+whitelist_externals = {[test-setup]whitelist_externals}
 commands = {[test-setup]commands}
 
 [testenv:pep8]
-basepython = python3.4
+basepython = python3.5
 deps =
     flake8
     pep8-naming