Merge pull request #23 from mespeche/master

Fix page.description variable (for meta tag description) bug
Merge pull request #24 from mespeche/master

Adding of willdurand plugin Anchorify
change submodule protocol
update address create/update events
add info about address removal
add cateogry events
add before/after on category object
create hook documentation and fix contribute part
complete hook part
change syntax