Add hack for building docs on RTFD

doc/source/conf.py

@@ -21,6 +21,31 @@ app = test.TestApp()
 RELEASE = version.get_version()
 VERSION = '.'.join(RELEASE.split('.')[:2])
 
+### Hack for Read The Docs:
+
+import sys
+
+class Mock(object):
+    def __init__(self, *args, **kwargs):
+        pass
+
+    def __call__(self, *args, **kwargs):
+        return Mock()
+
+    @classmethod
+    def __getattr__(cls, name):
+        if name in ('__file__', '__path__'):
+            return '/dev/null'
+        elif name[0] == name[0].upper():
+            mockType = type(name, (), {})
+            mockType.__module__ = __name__
+            return mockType
+        else:
+            return Mock()
+
+MOCK_MODULES = ['pylibmc']
+for mod_name in MOCK_MODULES:
+    sys.modules[mod_name] = Mock()
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the