switch the anjlab-bootstrap-rails to bootstrap-sass before move to bootstrap 3, because seems the latter has more active developer.
Using bootstrap 3 now
simple rename bootstrap 2 element to 3 using

http://getbootstrap.com/getting-started/#migration
update nav facility to using bootstrap 3 style
convert all united theme variable to bootstrap 3
icon not supported in bootstrap 3
Allow display images since Sublime 3 support to display image now.
Final adjust the style
Add back the reference display only in localhost
Optimize the Ubuntu web fonts to localhost, also add glyphicons-halflings as IE 8 require it.
Fix nav link color
using variable in bootstrap 3
final tuning the nav style
readme update
upgrade to official united theme
store html5shiv and respond.min to local
upgrade to 3.1.1

http://bootswatch.com/united/
disable assets debug by default
upgrade gems