Added setup.py so we can package the addon as ZIP.

`python setup.py bdist` creates dist/blender_cloud*.addon.zip, which can
be installed by Blender.

.gitignore

@@ -5,3 +5,5 @@
 blender_cloud/wheels/*.whl
 /textures*/
 /test_*.py
+/dist/
+/build/

setup.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+
+from distutils.command.bdist import bdist
+from distutils.command.install import install
+from distutils.command.install_egg_info import install_egg_info
+from setuptools import setup, find_packages
+from glob import glob
+
+
+class BlenderAddonBdist(bdist):
+    """Ensures that 'python setup.py bdist' creates a zip file."""
+
+    def initialize_options(self):
+        super().initialize_options()
+        self.formats = ['zip']
+        self.plat_name = 'addon'  # use this instead of 'linux-x86_64' or similar.
+
+
+class BlenderAddonInstall(install):
+    """Ensures the module is placed at the root of the zip file."""
+
+    def initialize_options(self):
+        super().initialize_options()
+        self.prefix = ''
+        self.install_lib = ''
+
+
+class AvoidEggInfo(install_egg_info):
+    """Makes sure the egg-info directory is NOT created.
+
+    If we skip this, the user's addon directory will be polluted by egg-info
+    directories, which Blender doesn't use anyway.
+    """
+
+    def run(self):
+        pass
+
+
+setup(
+    cmdclass={'bdist': BlenderAddonBdist,
+              'install': BlenderAddonInstall,
+              'install_egg_info': AvoidEggInfo},
+    name='blender_cloud',
+    description='The Blender Cloud addon allows browsing the Blender Cloud from Blender.',
+    version='1.0.0',
+    author='Sybren A. Stüvel',
+    author_email='sybren@stuvel.eu',
+    packages=find_packages('.'),
+    data_files=[('blender_cloud', ['README.md']),
+                ('blender_cloud/wheels', glob('blender_cloud/wheels/*.whl'))],
+    scripts=[],
+    url='https://developer.blender.org/diffusion/BCA/',
+    license='GNU General Public License v2 or later (GPLv2+)',
+    platforms='',
+    classifiers=[
+        'Intended Audience :: End Users/Desktop',
+        'Operating System :: OS Independent',
+        'Environment :: Plugins',
+        'License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)',
+        'Programming Language :: Python',
+        'Programming Language :: Python :: 3.5',
+    ],
+    zip_safe=False,
+)