Add migration for MemorySequence
Add memory sequence model and spec
+ spec for db index
+ Add associations from other models to memory sequences
+ Add abilities about sequences
* User can have personal memory sequences (does not belong to any community)
Maybe just share to friends
+ Controllers & views and locales
Add controller and view for my sequences
+ Add menu item linked to my sequences
+ Add headers to dropdown menu
* Improve the structure of locale file "components"
+ Add create time on sequence show page
+ Add actions links on memory sequence show page
$ Extract partial for sequence list to prepare for reuse
+ Add page for viewing other people's sequences
$ Make user controller use `rescue_from`
* Use standardize flash message
+ Add link to someone's memory sequences page
! Fix permitted param name in sequence controller
* Normal user can only change community of his sequences only when absent
* Admin can change it anyway
+ Show sequences in a community
+ Add link to a sequence's community if present