Add "servo-tidy" entry point

- also update requriements "pyflakes" from 0.8 to 0.8.1 due to following issue
```
Traceback (most recent call last):
  File "/Users/Askeing/software/servo/python/_virtualenv/bin/servo-tidy", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/Users/Askeing/software/servo/python/_virtualenv/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3084, in <module>
    @_call_aside
  File "/Users/Askeing/software/servo/python/_virtualenv/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3070, in _call_aside
    f(*args, **kwargs)
  File "/Users/Askeing/software/servo/python/_virtualenv/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3097, in
_initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/Users/Askeing/software/servo/python/_virtualenv/lib/python2.7/site-packages/pkg_resources/__init__.py", line 653, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/Users/Askeing/software/servo/python/_virtualenv/lib/python2.7/site-packages/pkg_resources/__init__.py", line 666, in
_build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/Users/Askeing/software/servo/python/_virtualenv/lib/python2.7/site-packages/pkg_resources/__init__.py", line 839, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pyflakes==0.8.1' distribution was not found and is required by servo-tidy
```

1 files changed, 5 insertions, 0 deletions

diff --git a/python/tidy/setup.py b/python/tidy/setup.py
index 958e5dd55c5..5b280fb21a4 100644
--- a/python/tidy/setup.py
+++ b/python/tidy/setup.py
@@ -49,4 +49,9 @@ if __name__ == '__main__':
         package_data={},
         install_requires=install_requires,
         zip_safe=False,
+        entry_points={
+            'console_scripts': [
+                'servo-tidy=servo_tidy.tidy:scan'
+            ],
+        },
     )