Show event/group cover in directory

Merge branch 'subgroup' into staging

Modified PostViewList API to view only first 20 posts

finish user edit, only birthday left

group.js: fixed page does not change while already in a group page

fix bug when post to null target(wall)

Merge branch 'notification' of https://github.com/whsatku/social into…

… notification

add some notification permalink

merge new design from design into group branch

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