Rename tests; update MANIFEST; add MANIFEST target to Makefile

MANIFEST

@@ -4,8 +4,8 @@ sample-api.py
 setup.cfg
 setup.py
 src/netns/__init__.py
-t/core.py
-t/interfaces.py
-t/node.py
-t/subprocess.py
-t/routing.py
+t/test_core.py
+t/test_interfaces.py
+t/test_node.py
+t/test_routing.py
+t/test_subprocess.py

Makefile

@@ -35,7 +35,13 @@ clean:
 distclean: clean
 	rm -rf "$(DISTDIR)"
 
-dist:
+MANIFEST:
+	find . -path ./.hg -prune -o -path ./build -prune -o \
+		-name \*.pyc -prune -o -name \*.swp -prune -o \
+		-name MANIFEST -prune -o -type f -print | \
+		sed 's#^\./##' | sort > MANIFEST
+
+dist: MANIFEST
 	./setup.py sdist
 
-.PHONY: clean distclean dist test coverage install
+.PHONY: clean distclean dist test coverage install MANIFEST