Have setuptools setup.py for serious distribution

This is a) cooler and b) a requirement for deploying it on PyPI.

It removes need of __all__ shit (which is hard to keep updated), and
allows installing instaloader easily as a global module and executable.
Additionally it removes __init__.py.

setup.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+
+from setuptools import setup
+
+setup(
+    name='instaloader',
+    version='1.0.1',
+    py_modules=['instaloader'],
+    url='https://github.com/Thammus/instaloader',
+    license='MIT',
+    author='Alexander Graf, André Koch-Kramer',
+    author_email='mail@agraf.me, koch-kramer@web.de',
+    description='Download pictures and captions from Instagram',
+    install_requires=['requests>=2.4'],
+    python_requires='>=3.3',
+    entry_points={'console_scripts': ['instaloader=instaloader:main']},
+    zip_safe=True,
+    keywords='instagram downloader',
+    classifiers=[
+        'Development Status :: 5 - Production/Stable',
+        'Environment :: Console',
+        'License :: OSI Approved :: MIT License',
+        'Operating System :: OS Independent',
+        'Programming Language :: Python :: 3.3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6'
+        'Topic :: Internet'
+    ]
+)