Moved custom module example to the cookbook section
Updated readme to explain relative paths for images
Updated german manual to use relative links for images
Updated english manual to use relative links for images
Merge branch '2.11' into 2.11-ja.
Catch up to 71df2b98fb0c7da82482254c9c523e15021a52f4.
Fix the line wrapping
Merge branch '2.11' into 2.11-ja.