Add AppVeyor support.

.appveyor.yml

@@ -0,0 +1,16 @@
+shallow_clone: true
+version: '{branch}-{build}'
+cache: C:\Users\appveyor\pip\wheels
+build: off
+environment:
+    PYTHON: 'C:\Python34'
+    PYTHONUNBUFFERED: 1
+
+install:
+  - C:\Python34\python -u scripts\appveyor_install.py
+
+test_script:
+  - C:\Python34\Scripts\tox -e smoke
+  - C:\Python34\Scripts\tox -e unittests
+  - C:\Python34\Scripts\tox -e pyflakes
+  - C:\Python34\Scripts\tox -e pylint

scripts/appveyor_install.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
+
+# Copyright 2015 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
+
+# This file is part of qutebrowser.
+#
+# qutebrowser is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# qutebrowser is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Install needed prerequisites on the AppVeyor CI."""
+
+import subprocess
+import urllib.request
+
+PYQT_VERSION = '5.4.1'
+
+print("Getting PyQt5...")
+urllib.request.urlretrieve(
+    ('http://sourceforge.net/projects/pyqt/files/PyQt5/PyQt-{v}/'
+     'PyQt5-{v}-gpl-Py3.4-Qt{v}-x32.exe'.format(v=PYQT_VERSION)),
+    r'C:\install-PyQt5.exe')
+
+print("Installing PyQt5...")
+subprocess.check_call([r'C:\install-PyQt5.exe', '/S'])
+
+print("Installing tox...")
+subprocess.check_call([r'C:\Python34\Scripts\pip', 'install', 'tox'])
+
+print("Linking Python...")
+with open(r'C:\Windows\system32\python3.bat', 'w', encoding='ascii') as f:
+    f.write(r'@C:\Python34\python %*')