Rails core - May 2014 - Configuration option to use - for generated HTML instead of _

It would be nice if there was a configuration option to use dashes instead 
of underscores when generating HTML ids and classes class="foo-bars"
instead
of class=foo_bars.

Many popular libraries such as Bootstrap and Foundation use dashes for 
their classes and it would be nice to have some consistency in our 
applications.

*I apologize if this issue has been presented before but I couldn't find 
reference to it anywhere*

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