Renamed the script.

MANIFEST.in

 include LICENSE OWNERS README
-include chkcrontab.py
+include chkcrontab
 include chkcrontab_lib.py
 include setup.py
 recursive-include tests test*

README

 Crontab linter.
 
-chkcrontab.py is a script to check crontab files like those in
+chkcrontab is a script to check crontab files like those in
 /etc/cron.d and /etc/crontab.  It tries to catch glaring errors
 and warn on suspect lines in a crontab file.  Some valid lines
 will generate warnings.  Certain silly yet valid crontab lines
 will generate errors as well.
 
-Run this by doing ./chkcrontab.py crontab_file
+Run this by doing ./chkcrontab crontab_file
 
 Errors will cause a non-zero exit code.  Warnings alone will not.
 
 To see sample output for a bad crontab, run the following:
 
-  ./chkcrontab.py ./tests/test_crontab
+  ./chkcrontab ./tests/test_crontab
 
 See the ./tests/test_crontab.disable crontab for how to disable
 warnings and errors.

setup.py

@@ -129,7 +129,7 @@ setup(
     description='A tool to detect crontab errors',
     long_description=open('README').read(),
     py_modules=['chkcrontab_lib'],
-    scripts=['chkcrontab.py'],
+    scripts=['chkcrontab'],
     keywords='check lint crontab',
     # See http://pypi.python.org/pypi?%3Aaction=list_classifiers
     license = 'Apache Software License',