Added simple testing of the README to make sure it includes a mention…

… of each code file

test_docs.py

@@ -0,0 +1,17 @@
+import py
+
+dirpath = py.path.local("./")
+
+def pytest_generate_tests(metafunc):
+    if "filename" in metafunc.funcargnames:
+        for fpath in dirpath.visit('*.scad'):
+            metafunc.addcall(funcargs=dict(filename=fpath.basename))
+        for fpath in dirpath.visit('*.py'):
+            name = fpath.basename
+            if not name.startswith('test_'):
+                metafunc.addcall(funcargs=dict(filename=fpath.basename))
+
+def test_README(filename):
+    README = dirpath.join('README').read()
+
+    assert filename in README