Add language selector to the docs&primary-nav

Add language selector,and change twitter to weibo because we cann’t
visit twitter at china :(
This file should be in the last commit
Remove console.log in view function

There was a console.log in view function to show the
req.session.currentLanguage for debug,not need it anymore.
sync with upstream
fix space missing.
Merge pull request #799 from weekwood/master

fix space missing.
change '资产' -> '资源'
fix static asset - > '静态资源'

Reference:
asset pipeline in rails http://guides.ruby-china.org/asset_pipeline.html
asset catalog in iOS http://mued.sohu.com/2013/06/ios-7-ui-transition-guide/
Merge branch 'master' of github.com:weekwood/keystone
Fixing broken location filters
Fixing broken boolean filters
Updating changelog
v0.2.38
Merge remote-tracking branch 'upstream/master'
add "static options" in zh docs
sync docs.js with upstream
sync docs.js with upstream
revert to '资产'
fix static asset
Merge pull request #806 from wuhaixing/master

Add "static options" in zh docs
Merge pull request #801 from weekwood/master

fix asset translation
change keystone.list to keystone.lists