Merge pull request #244 from siuying/locale-topics

add some localizations
Merge branch 'master' of git://github.com/huacnlee/ruby-china into feature
delete old atwho file
Merge pull request #245 from ichord/feature

@mention 更新, 改用 gem.
Now can custom gravatar host as a proxy url.
lock gem version.
Revert jquery-atwho-rails, 0.1.1 has bug on Firefox.
Update app/assets/javascripts/app.coffee
Update Gemfile
Update Gemfile
Merge pull request #255 from ichord/master

修复 jquery-atwho-rails bug.
fixed the layout of nodes in topics/index_secitons.html.erb
Merge pull request #256 from Fleurer/fix_links_layout

fixed the layout of nodes in topics/index_secitons.html.erb
add more fields (sort, topics_count, summary) to noeds.json api. Fixed issue #251
Merge pull request #258 from qichunren/master

Fixed issue #251
Fix feed no content bug. #260
Fix issue #246, and rename a typo Javascript method.
Favroite topic methods for User.
Implement favorite topic feature, issue #254;
Add small_icon psd;
Move /users/:id/likes to /users/:id/favorites
Fix tests for likeable_tag and topic_favorite_tag.