add comment model
commentable concern
starting commments views
commentable route concern + comment input
improve comment _list form and access control
comments controller
comment component + comment partial rendering
add comment styling + fix N+1 query
remove unused route + clean editor after submit
fix validations errors cleanup
comment notifications
add comments to geo_data
add specs
comments_controller spec
Merge pull request #83 from it3s/talk

Talk
refactor activities and contributings views
add dashboard controller and view
fix modal zindex issue
add jquery.sticky-kit
fix sticky columns behavior