Get rid of s2i packaging code from setup.py

We no longer use s2i, so no need to do all the wheel
business!

setup.py

@@ -1,95 +1,7 @@
 from __future__ import print_function
 
-import hashlib
-import os
-import sys
-import tarfile
-
-try:
-    from urllib.request import urlopen
-except ImportError:
-    from urllib import urlopen
-
 from setuptools import setup, find_packages
 
-tgz = 'source-to-image-v1.1.6-f519129-{}-amd64.tar.gz'.format(sys.platform)
-s2i_bin_url = 'https://github.com/openshift/source-to-image/releases/download/v1.1.6/' + tgz
-
-checksums = {
-    'darwin': '0398bb5cd1d77a59ed9780ec4e2edd3b0c70e973d66b6ae5c072a8830029d703',
-    'linux': '85ed735d141da1fe3def7826910c0c0baf587df6c727529b52d2c5cd98dcb641',
-}
-
-
-def download_s2i():
-    if os.path.exists(tgz):
-        print("Already have %s" % tgz)
-        return
-    print("Downloading %s" % s2i_bin_url)
-    reader = urlopen(s2i_bin_url)
-    with open(tgz, 'wb') as f:
-        f.write(reader.read())
-    reader.close()
-
-
-def stage_s2i():
-    """Stage s2i binary into repo2docker"""
-    print("Staging %s" % s2i_dest)
-    with tarfile.open(tgz) as f:
-        f.extract('./s2i', pkg)
-
-
-def checksum_s2i():
-    """Check the checksum of the s2i binary"""
-    with open(s2i_dest, 'rb') as f:
-        found_hash = hashlib.sha256(f.read()).hexdigest()
-    expected = checksums[sys.platform]
-    if found_hash != expected:
-        print("Checksum mismatch %s != %s" % (found_hash, expected))
-    return found_hash == expected
-
-
-def have_s2i():
-    """Do we already have s2i?"""
-    if not os.path.exists(s2i_dest):
-        return False
-    return checksum_s2i()
-
-
-here = os.path.dirname(os.path.abspath(__file__))
-pkg = os.path.join(here, 'repo2docker')
-
-s2i_dest = os.path.join(pkg, 's2i')
-
-if sys.platform in checksums:
-    if not have_s2i():
-        download_s2i()
-        stage_s2i()
-
-    if not checksum_s2i():
-        print("s2i checksum failed", file=sys.stderr)
-        sys.exit(1)
-else:
-    print("I don't know how to bundle s2i for %s" % sys.platform)
-
-cmdclass = {}
-try:
-    from wheel.bdist_wheel import bdist_wheel
-    from wheel.pep425tags import get_platform
-except ImportError:
-    # no wheel
-    pass
-else:
-    # apply current platform tag
-    # because we bundle platform-specific s2i binaries
-    class PlatformBDistWheel(bdist_wheel):
-        def initialize_options(self):
-            super(PlatformBDistWheel, self).initialize_options()
-            if self.plat_name is None:
-                self.plat_name = get_platform()
-
-    cmdclass['bdist_wheel'] = PlatformBDistWheel
-
 setup(
     name='jupyter-repo2docker',
     version='0.2.10',
@@ -103,10 +15,6 @@ setup(
     author='Yuvi Panda',
     author_email='yuvipanda@gmail.com',
     license='BSD',
-    cmdclass=cmdclass,
-    package_data={
-        'repo2docker': ['s2i'],
-    },
     packages=find_packages(),
     entry_points={
         'console_scripts': [