Add examples as separated '*.pip' files

examples/extension-pip/developer.pip

@@ -0,0 +1,6 @@
+-r test.pip
+
+# Development
+flake8
+-e git+https://github.com/public/flake8-import-order#egg=flake8-import-order
+sphinx

examples/extension-pip/owner.pip

@@ -0,0 +1,6 @@
+-r developer.pip
+
+# Release issuance
+tox
+bumpr==0.2.0
+wheel

examples/extension-pip/test.pip

@@ -0,0 +1,3 @@
+BeautifulSoup4
+lxml
+typogrify