Pin PyInstaller

.travis.yml

@@ -26,7 +26,7 @@ install:
   # Install dependencies for tests.
   - pip install -r tests/requirements.txt | cat
 
-  - pip install git+http://github.com/pyinstaller/pyinstaller
+  - pip install git+http://github.com/pyinstaller/pyinstaller@5f91905
 
   # Install qt4 from third-party source
   # https://github.com/cartr/homebrew-qt4

appveyor.yml

@@ -42,7 +42,7 @@ install:
   - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
   - pip install https://github.com/mcedit/mcedit2-deps/raw/master/wheels/PySide-1.2.2-cp27-none-win%WHL_ARCH%.whl
   - pip install -r requirements.txt
-  - pip install git+http://github.com/pyinstaller/pyinstaller
+  - pip install git+http://github.com/pyinstaller/pyinstaller@5f91905
 
 build_script:
   - pyinstaller mcedit2.spec