fix app file
add Picture model
add controller
fix style
add active admin
fix active admin & add picture
Merge branch 'active_admin' into images
add picture category
Merge branch 'images' into dev
add devise User
add device views
add like model
add categories controller
Merge branch 'user' into dev
Merge branch 'dev' into images
add counter for picture in categories
fix controller & views
Merge branch 'images' into dev
Merge branch 'dev' into user
fix style and add pagination views