gracefully fall back from py3 (#48)

...kind of a pointless nicety since neither seem to work, but...

docs/source/conf.py

@@ -17,11 +17,13 @@
 import shlex
 
 # https://read-the-docs.readthedocs.org/en/latest/faq.html#i-get-import-errors-on-libraries-that-depend-on-c-modules
-#from mock import Mock as MagicMock
-    #py27 import
-from unittest.mock import MagicMock
+try:
     #py3 import
-
+    from unittest.mock import MagicMock
+except ImportError:
+    #py27 import
+    from mock import Mock as MagicMock
+
 class Mock(MagickMock):
     @classmethod
     def __getattr__(cls, name):

docs/source/index.rst.leo

@@ -12,7 +12,7 @@
 <vnodes>
 <v t="maphew.20150613204824.4"><vh>@persistence</vh>
 <v t="maphew.20150613204824.5" a="E"><vh>@data:@auto conf.py</vh>
-<v t="maphew.20150613204824.9"><vh>@gnxs</vh></v>
+<v t="maphew.20150613204824.11"><vh>@gnxs</vh></v>
 </v>
 </v>
 <v t="maphew.20150601230033.5" a="E"><vh>Apt - Read The Docs</vh>
@@ -24,11 +24,11 @@
 <tnodes>
 <t tx="maphew.20150601230033.5">@path b:\code\apt\docs\source
 </t>
+<t tx="maphew.20150613204824.11">gnx: maphew.20150613204824.3
+unl: conf declarations
+</t>
 <t tx="maphew.20150613204824.4"></t>
 <t tx="maphew.20150613204824.5">gnx: maphew.20150613204824.2
 </t>
-<t tx="maphew.20150613204824.9">gnx: maphew.20150613204824.3
-unl: conf declarations
-</t>
 </tnodes>
 </leo_file>