appveyor fix

Author: spderosso

.appveyor.yml

@@ -7,7 +7,7 @@ environment:
     PYTHON: 'C:\Python27-x64\python.exe'
 
 init:
-  - cmd: '%PYTHON% -m pip install -r requirements.txt -U nose wheel'
+  - cmd: '%PYTHON% -m pip install -U nose wheel'
 
 build: off
 
@@ -18,7 +18,7 @@ before_test:
 test_script:
   - ps: |
       # e2e tests require `gl` binary
-      &$env:PYTHON -m pip install .
+      &$env:PYTHON -m pip install -r requirements.txt .
       # 'gl' is installed in Python Scripts directory
       $env:PATH += ";$(Split-Path $env:PYTHON)\Scripts"
       &$env:PYTHON setup.py nosetests --logging-level=WARN --with-xunit