Be less aggressive about calling that

- Only do so if the command was called, and do so on the top level as
  the methods are executed separately, so the atexit registration must
  be done on construction.

.flake8

@@ -19,5 +19,6 @@ include =
 exclude =
     src/calmjs/parse/parsers/*tab*.py,
     .git,
+    .eggs,
     .env*,
     env*

setup.py

@@ -1,7 +1,27 @@
+import atexit
 import sys
 from setuptools import setup, find_packages
+from setuptools.command.develop import develop
+from setuptools.command.install import install
 from subprocess import call
 
+
+class DevelopHook(develop):
+    """For hooking the optimizer when setup exits"""
+    def __init__(self, *a, **kw):
+        develop.__init__(self, *a, **kw)
+        atexit.register(
+            call, [sys.executable, '-m', 'calmjs.parse.parsers.optimize'])
+
+
+class InstallHook(install):
+    """For hooking the optimizer when setup exits"""
+    def __init__(self, *a, **kw):
+        install.__init__(self, *a, **kw)
+        atexit.register(
+            call, [sys.executable, '-m', 'calmjs.parse.parsers.optimize'])
+
+
 version = '0.9.0'
 
 classifiers = """
@@ -41,13 +61,14 @@
     namespace_packages=['calmjs'],
     include_package_data=True,
     zip_safe=False,
+    cmdclass={
+        'develop': DevelopHook,
+        'install': InstallHook,
+    },
     install_requires=[
         'ply>=3.6',
     ],
-    entry_points="""
-    # -*- Entry points: -*-
-    """,
+    entry_points={
+    },
     test_suite="calmjs.parse.tests.make_suite",
 )
-
-call([sys.executable, '-m', 'calmjs.parse.parsers.optimize'])