Add Setuptools integration issue #261

These changes enable any user that installs `isort` to check his source
code from setup.py with the command `python setup.py isort`

I also checked isort package code with his command in tox and travis.

Acknowledgements: this is mostly inspired by flake8 setuptools integration,
see [flake8 doc](http://flake8.readthedocs.org/en/2.2.3/setuptools.html)

1 files changed, 2 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 124bea32..f51220f7 100755
--- a/setup.py
+++ b/setup.py
@@ -53,7 +53,8 @@ setup(name='isort',
       entry_points={
         'console_scripts': [
             'isort = isort.main:main',
-        ]
+        ],
+        'distutils.commands': ['isort = isort.main:ISortCommand'],
       },
       packages=['isort'],
       requires=['pies', 'natsort'],