Miscellaneous CI fixes (addresses #32)

Author: wjakob

.appveyor.yml

@@ -6,6 +6,7 @@ platform:
 environment:
   global:
     DISTUTILS_USE_SDK: 1
+    PYTHONWARNINGS: ignore:DEPRECATION
     MSSdk: 1
   matrix:
   - PYTHON: 27
@@ -32,9 +33,14 @@ build_script:
 - ps: |
     if ($env:PYTHON) {
       python setup.py sdist
-      pip install --verbose dist\python_example-0.0.1.tar.gz
+      python -m pip install 'pybind11>=2.3'
+      cd dist
+      python -m pip install --verbose python_example-0.0.1.tar.gz
+      cd ..
     } else {
+      echo "conda build conda.recipe"
       conda build conda.recipe
+      echo "conda install --use-local python_example"
       conda install --use-local python_example
     }
 test_script:

.travis.yml

@@ -5,7 +5,7 @@ matrix:
   - os: linux
     env: PYTHON=2.7
   - os: linux
-    env: PYTHON=3.5
+    env: PYTHON=3.6
   - os: linux
     env: CONDA=2.7
   - os: linux
@@ -22,11 +22,14 @@ before_install:
 - |
   if [ "$TRAVIS_OS_NAME" = "linux" ]; then export CXX=g++-4.8 CC=gcc-4.8; fi
   if [ -n "$PYTHON" ]; then
-    if [ "$TRAVIS_OS_NAME" = "osx" ] && [ "${PYTHON:0:1}" = "3" ]; then
-      brew update; brew install python3;
+    if [ "$TRAVIS_OS_NAME" = "osx" ]; then
+      export PATH="/Users/travis/Library/Python/2.7/bin:$PATH"
+      if [ "${PYTHON:0:1}" = "3" ]; then
+        brew update; brew install python3;
+      fi
     fi
-    pip install --user --upgrade pip virtualenv
-    virtualenv -p python$PYTHON venv
+    python -m pip install --user virtualenv
+    virtualenv -p python${PYTHON:0:1} venv
     source venv/bin/activate
   elif [ -n "$CONDA" ]; then
     if [ "$TRAVIS_OS_NAME" = "linux" ]; then OS=Linux-x86_64; else OS=MacOSX-x86_64; fi
@@ -44,7 +47,8 @@ install:
 - |
   if [ -n "$PYTHON" ]; then
     python setup.py sdist
-    pip install --verbose dist/*.tar.gz
+    python -m pip install 'pybind11>=2.3'
+    python -m pip install --verbose dist/*.tar.gz
   elif [ -n "$CONDA" ]; then
     conda build conda.recipe
     conda install --use-local python_example

setup.py

@@ -106,7 +106,8 @@ def build_extensions(self):
     description='A test project using pybind11',
     long_description='',
     ext_modules=ext_modules,
-    install_requires=['pybind11>=2.2'],
+    install_requires=['pybind11>=2.3'],
+    setup_requires=['pybind11>=2.3'],
     cmdclass={'build_ext': BuildExt},
     zip_safe=False,
 )