Keeping the user guide source out of the dist files.
diff --git a/.gitattributes b/.gitattributes
index c77437b..68d6b5b 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -18,3 +18,5 @@
 tests/codeigniter/ export-ignore
 tests/travis/ export-ignore
 
+# User Guide Source Files
+user_guide_src