Migrate to native namespaces

Change-Id: I153fee3f8a874558e76cb5402898d629afa498a4
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

setup.cfg

@@ -8,13 +8,6 @@ home-page = https://github.com/dagrejs/dagre
 keywords = dagre xstatic
 license = (same as Dagre)
 zip_safe = False
-namespace_packages =
-    xstatic
-    xstatic.pkg
-
-[files]
-packages =
-    xstatic
 
 [bdist_wheel]
 universal = True

setup.py

@@ -1,4 +1,4 @@
-from setuptools import setup, find_packages
+from setuptools import setup, find_namespace_packages
 from xstatic.pkg import dagre as xs
 
 # The README.txt file should be written in reST so that PyPI can use
@@ -18,8 +18,7 @@ setup(
     license=xs.LICENSE,
     url=xs.HOMEPAGE,
     platforms=xs.PLATFORMS,
-    packages=find_packages(),
-    namespace_packages=['xstatic', 'xstatic.pkg'],
+    packages=find_namespace_packages(),
     include_package_data=True,
     zip_safe=False,
     install_requires=[],

xstatic/__init__.py

@@ -1 +0,0 @@
-__import__('pkg_resources').declare_namespace(__name__)

xstatic/pkg/__init__.py

@@ -1 +0,0 @@
-__import__('pkg_resources').declare_namespace(__name__)