Begin post-2.8.12 development

Source/CMakeVersion.cmake

@@ -2,5 +2,5 @@
 set(CMake_VERSION_MAJOR 2)
 set(CMake_VERSION_MINOR 8)
 set(CMake_VERSION_PATCH 12)
-set(CMake_VERSION_TWEAK 0)
-#set(CMake_VERSION_RC 0)
+set(CMake_VERSION_TWEAK 20131007)
+#set(CMake_VERSION_RC 1)