Update the gem to use newer rails bootstraps

[Mark Dunne]

https://github.com/twbs/bootstrap-sass is the main bootstrap for rails gem, and the version of bootstrap that bootstrap-wysihtml5-rails uses is outdated

[Gonzalo Rodríguez-Baltanás Díaz]

Hi,

I am not sure what you are asking. We don't package bootstrap in this gem, so you can use any source. This gem supports both b2 and b3. It defaults to the first one.

*= require bootstrap-wysihtml5
// or
*= require bootstrap-wysihtml5/b3

Does that answer your question?