BUG: Fix bug caused by missing attribute during bdist_wheel

Related to [AIM-Harvard#257 in pypa/wheel](pypa/wheel#257).

Newest version of wheel now expects the requirements object returned by `pkg_resources.Requirement.parse(req)` to have an url attribute.
Change the installation of setuptools to ensure correct setuptools version is used.

appveyor.yml

@@ -15,7 +15,7 @@ environment:
       PYTHON_VERSION: "3.4.x"
       PYTHON_SHORT_VERSION: "3.4"
       PYTHON_ARCH: "64"
-      BLOCK: "0"
+      BLOCK: "1"
 
     - PYTHON_DIR: "C:\\Python35-x64"
       PYTHON_VERSION: "3.5.x"
@@ -31,6 +31,7 @@ environment:
 
 init:
   - ps: iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+  - python -m pip install setuptools --upgrade
   - python -m pip install scikit-ci==0.13.0 scikit-ci-addons==0.11.0
   - python -m ci_addons --install ../addons
   - python -m pip install twine

scikit-ci.yml

@@ -27,10 +27,9 @@ before_install:
 install:
   commands:
     - python --version
-    - python -m pip install --disable-pip-version-check --upgrade pip
+    - pip install --disable-pip-version-check --upgrade pip
     - $<RUN_ENV> pip install wheel>=0.29.0
     - $<RUN_ENV> pip install setuptools>=38.6.0
-    - $<RUN_ENV> pip install numpy>=1.9.2
     - $<RUN_ENV> pip install --trusted-host www.itk.org -f https://itk.org/SimpleITKDoxygen/html/PyDownloadPage.html SimpleITK>=0.9.1
     - $<RUN_ENV> python -c "import SimpleITK; print('SimpleITK Version:' + SimpleITK.Version_VersionString())"
     - $<RUN_ENV> pip install -r requirements.txt