homepage show notification feature.
#401 popup a modal to show full size map image
#401 adjust modal css
#401 add hint message
Merge pull request #409 from saberma/saberma-enhancement/406-homepage-show-notification-feature

首页显示通知特性
Merge pull request #411 from loveky/issue#401

#401 点击地图图片，显示原始大小的地图图片
update gems to work with rails4
add replies count with topic in event show view
uesd border-radius mixin with scss
config: to rails4
fix strong parameters problems
Reproduce the unmatch foreign key bug

Refs #419, #421
Override the foreign_key of GroupTopicReply#topic

Fixed #421, refs #419
Merge pull request #422 from doitian/421-unmatch-foreign-key

421 unmatch foreign key
change acts_as_follower gem
fix strong parameters for devise and devise_invitable
fix query statement
remove `protected attributes` usage from event spec
extend badge class in replies-count class
remove about before_save code because this has fixed in #421