Support for Bootstrap and other dialects

[mattboehm]

Working on bootstrap sites usually involves a lot of additional boilerplate (see http://getbootstrap.com/components/ for some examples). It would be great if sparkup could be used to simplify this.

In order to achieve this, either sparkup would have to ship with extra tags, or it would need a method for users to add their own tags (or both).

If adding the tags to sparkup, either they all get added to the HtmlDialect, they get added to a BootstrapDialect that inherits from the HtmlDialect, or they get added to a distinct BootstrapDialect, and all dialects are searched when trying to expand tags.

Let me know your thoughts on this. I'm happy to help out or take this task on personally if you think it's a worthwhile addition.