update comments controller
update posts controller
update site controller
update tags controller
add show page for comments
update show page for pages
add tag field to edit post page
update posts index
add tag field to new post page
add tags & comments to show post page
add about us page
validate tags on index page & link them to tag show page
add tag show page
fix typo in edit user page
add link to all user's posts on user show page
add tags resource to routes
Merge pull request #36 from smonette/start_tags_comments

Added some tag & comment functionality